Irritable Bowel Syndrome (Clinical)

Epidemiology and Pathophysiology

Epidemiology^[2,3,7]

The onset of symptoms usually begins in adolescence and young adulthood. Approximately 50% of patients Patients Individuals participating in the health care system for the purpose of receiving therapeutic, diagnostic, or preventive procedures. Clinician–Patient Relationship report symptoms before the age of 35.
60%–70% of cases are women.
Prevalence Prevalence The total number of cases of a given disease in a specified population at a designated time. It is differentiated from incidence, which refers to the number of new cases in the population at a given time. Measures of Disease Frequency in North America is 10%–15%.

Pathophysiology^[1,4,8]

Although no specific organic cause has been identified, there are several possible pathogenic mechanisms.

Abnormal motility Motility The motor activity of the gastrointestinal tract. Gastrointestinal Motility:
- ↑ Frequency of luminal contractions in the intestines
- Irregularity of luminal contractions
- Slow transit → irritable bowel syndrome Irritable bowel syndrome Irritable bowel syndrome (IBS) is a functional bowel disease characterized by chronic abdominal pain and altered bowel habits without an identifiable organic cause. The etiology and pathophysiology of this disease are not well understood, and there are many factors that may contribute. Irritable Bowel Syndrome ( IBS IBS Irritable bowel syndrome (IBS) is a functional bowel disease characterized by chronic abdominal pain and altered bowel habits without an identifiable organic cause. The etiology and pathophysiology of this disease are not well understood, and there are many factors that may contribute. Irritable Bowel Syndrome) with constipation Constipation Constipation is common and may be due to a variety of causes. Constipation is generally defined as bowel movement frequency < 3 times per week. Patients who are constipated often strain to pass hard stools. The condition is classified as primary (also known as idiopathic or functional constipation) or secondary, and as acute or chronic. Constipation
- ↑ Motor Motor Neurons which send impulses peripherally to activate muscles or secretory cells. Nervous System: Histology response to cholecystokinin Cholecystokinin A peptide, of about 33 amino acids, secreted by the upper intestinal mucosa and also found in the central nervous system. It causes gallbladder contraction, release of pancreatic exocrine (or digestive) enzymes, and affects other gastrointestinal functions. Cholecystokinin may be the mediator of satiety. Gastrointestinal Secretions and meals → IBS IBS Irritable bowel syndrome (IBS) is a functional bowel disease characterized by chronic abdominal pain and altered bowel habits without an identifiable organic cause. The etiology and pathophysiology of this disease are not well understood, and there are many factors that may contribute. Irritable Bowel Syndrome with diarrhea Diarrhea Diarrhea is defined as ≥ 3 watery or loose stools in a 24-hour period. There are a multitude of etiologies, which can be classified based on the underlying mechanism of disease. The duration of symptoms (acute or chronic) and characteristics of the stools (e.g., watery, bloody, steatorrheic, mucoid) can help guide further diagnostic evaluation. Diarrhea
Visceral hyperalgesia Hyperalgesia An increased sensation of pain or discomfort produced by minimally noxious stimuli due to damage to soft tissue containing nociceptors or injury to a peripheral nerve. Pain: Types and Pathways:
- Hypothesized to be due to ↑ receptor Receptor Receptors are proteins located either on the surface of or within a cell that can bind to signaling molecules known as ligands (e.g., hormones) and cause some type of response within the cell. Receptors stimulation in the gut wall
- ↑ Sensitivity to abdominal and rectal distension
- ↑ Sensitivity to bloating Bloating Constipation and gas
Intestinal inflammation Intestinal inflammation Irritable Bowel Syndrome:
- ↑ Lymphocytes Lymphocytes Lymphocytes are heterogeneous WBCs involved in immune response. Lymphocytes develop from the bone marrow, starting from hematopoietic stem cells (HSCs) and progressing to common lymphoid progenitors (CLPs). B and T lymphocytes and natural killer (NK) cells arise from the lineage. Lymphocytes: Histology and mast cells Mast cells Granulated cells that are found in almost all tissues, most abundantly in the skin and the gastrointestinal tract. Like the basophils, mast cells contain large amounts of histamine and heparin. Unlike basophils, mast cells normally remain in the tissues and do not circulate in the blood. Mast cells, derived from the bone marrow stem cells, are regulated by the stem cell factor. Innate Immunity: Phagocytes and Antigen Presentation have been noted in the bowel → possible ↑ release of mediators that stimulate the enteric nervous system Enteric nervous system Two ganglionated neural plexuses in the gut wall which form one of the three major divisions of the autonomic nervous system. The enteric nervous system innervates the gastrointestinal tract, the pancreas, and the gallbladder. It contains sensory neurons, interneurons, and motor neurons. Thus the circuitry can autonomously sense the tension and the chemical environment in the gut and regulate blood vessel tone, motility, secretions, and fluid transport. The system is itself governed by the central nervous system and receives both parasympathetic and sympathetic innervation. Autonomic Nervous System: Anatomy
Post-infectious changes:
- ↑ T cells T cells Lymphocytes responsible for cell-mediated immunity. Two types have been identified – cytotoxic (t-lymphocytes, cytotoxic) and helper T-lymphocytes (t-lymphocytes, helper-inducer). They are formed when lymphocytes circulate through the thymus gland and differentiate to thymocytes. When exposed to an antigen, they divide rapidly and produce large numbers of new T cells sensitized to that antigen. T cells: Types and Functions and enteroendocrine cells Enteroendocrine cells Cells found throughout the lining of the gastrointestinal tract that contain and secrete regulatory peptide hormones and/or biogenic amines. Gastrointestinal Secretions → ↑ serotonin Serotonin A biochemical messenger and regulator, synthesized from the essential amino acid l-tryptophan. In humans it is found primarily in the central nervous system, gastrointestinal tract, and blood platelets. Serotonin mediates several important physiological functions including neurotransmission, gastrointestinal motility, hemostasis, and cardiovascular integrity. Receptors and Neurotransmitters of the CNS levels → ↑ gastrointestinal (GI) motility Motility The motor activity of the gastrointestinal tract. Gastrointestinal Motility and sensitivity
- Antibiotic use may also play a role.
Psychosocial abnormalities:
- > 50% of IBS IBS Irritable bowel syndrome (IBS) is a functional bowel disease characterized by chronic abdominal pain and altered bowel habits without an identifiable organic cause. The etiology and pathophysiology of this disease are not well understood, and there are many factors that may contribute. Irritable Bowel Syndrome patients Patients Individuals participating in the health care system for the purpose of receiving therapeutic, diagnostic, or preventive procedures. Clinician–Patient Relationship have underlying depression, anxiety Anxiety Feelings or emotions of dread, apprehension, and impending disaster but not disabling as with anxiety disorders. Generalized Anxiety Disorder, or somatization Somatization Somatic Symptom Disorder disorders.
- Stress → may ↑ corticotropin-releasing factor activity (mediator of the stress response) → ↑ abdominal pain Abdominal Pain Acute Abdomen and colonic motility Motility The motor activity of the gastrointestinal tract. Gastrointestinal Motility → ↑ IBS IBS Irritable bowel syndrome (IBS) is a functional bowel disease characterized by chronic abdominal pain and altered bowel habits without an identifiable organic cause. The etiology and pathophysiology of this disease are not well understood, and there are many factors that may contribute. Irritable Bowel Syndrome symptoms
Other factors that are being investigated:
- Altered fecal flora or small intestinal bacterial overgrowth Bacterial overgrowth Lactose Intolerance
- Food allergies Allergies A medical specialty concerned with the hypersensitivity of the individual to foreign substances and protection from the resultant infection or disorder. Selective IgA Deficiency, malabsorption Malabsorption General term for a group of malnutrition syndromes caused by failure of normal intestinal absorption of nutrients. Malabsorption and Maldigestion, and sensitivity
- Genetics Genetics Genetics is the study of genes and their functions and behaviors. Basic Terms of Genetics

Mind-gut interaction contributing to the pathophysiology of ibs — The mind-gut interaction contributing to the pathophysiology of IBS: stress, anxiety, and depression influence the CNS, autonomic nervous system (ANS), and enteric nervous system. This may affect the smooth muscles in the intestines, leading to the symptoms of IBS.
Image by Lecturio.

Clinical Presentation

Classification^[7–9]

Irritable bowel syndrome Irritable bowel syndrome Irritable bowel syndrome (IBS) is a functional bowel disease characterized by chronic abdominal pain and altered bowel habits without an identifiable organic cause. The etiology and pathophysiology of this disease are not well understood, and there are many factors that may contribute. Irritable Bowel Syndrome is classified based on the clinical presentation.

IBS IBS Irritable bowel syndrome (IBS) is a functional bowel disease characterized by chronic abdominal pain and altered bowel habits without an identifiable organic cause. The etiology and pathophysiology of this disease are not well understood, and there are many factors that may contribute. Irritable Bowel Syndrome with predominant diarrhea Diarrhea Diarrhea is defined as ≥ 3 watery or loose stools in a 24-hour period. There are a multitude of etiologies, which can be classified based on the underlying mechanism of disease. The duration of symptoms (acute or chronic) and characteristics of the stools (e.g., watery, bloody, steatorrheic, mucoid) can help guide further diagnostic evaluation. Diarrhea (IBS-D):
- Loose or watery stools
- Frequent bowel movements (> 3/day)
- Fecal urgency +/– incontinence
IBS IBS Irritable bowel syndrome (IBS) is a functional bowel disease characterized by chronic abdominal pain and altered bowel habits without an identifiable organic cause. The etiology and pathophysiology of this disease are not well understood, and there are many factors that may contribute. Irritable Bowel Syndrome with predominant constipation Constipation Constipation is common and may be due to a variety of causes. Constipation is generally defined as bowel movement frequency < 3 times per week. Patients who are constipated often strain to pass hard stools. The condition is classified as primary (also known as idiopathic or functional constipation) or secondary, and as acute or chronic. Constipation (IBS-C):
- Hard or lumpy stools
- Infrequent bowel movements (< 3/week)
- Straining during defecation Defecation The normal process of elimination of fecal material from the rectum. Gastrointestinal Motility
IBS IBS Irritable bowel syndrome (IBS) is a functional bowel disease characterized by chronic abdominal pain and altered bowel habits without an identifiable organic cause. The etiology and pathophysiology of this disease are not well understood, and there are many factors that may contribute. Irritable Bowel Syndrome with mixed bowel habits (IBS-M): presents with both diarrhea Diarrhea Diarrhea is defined as ≥ 3 watery or loose stools in a 24-hour period. There are a multitude of etiologies, which can be classified based on the underlying mechanism of disease. The duration of symptoms (acute or chronic) and characteristics of the stools (e.g., watery, bloody, steatorrheic, mucoid) can help guide further diagnostic evaluation. Diarrhea and constipation Constipation Constipation is common and may be due to a variety of causes. Constipation is generally defined as bowel movement frequency < 3 times per week. Patients who are constipated often strain to pass hard stools. The condition is classified as primary (also known as idiopathic or functional constipation) or secondary, and as acute or chronic. Constipation
Unclassified IBS IBS Irritable bowel syndrome (IBS) is a functional bowel disease characterized by chronic abdominal pain and altered bowel habits without an identifiable organic cause. The etiology and pathophysiology of this disease are not well understood, and there are many factors that may contribute. Irritable Bowel Syndrome: insufficient abnormality in the stool consistency Consistency Dermatologic Examination or frequency to meet criteria for the other types

Other signs and symptoms^[2,3,9]

Chronic abdominal pain Abdominal Pain Acute Abdomen
- Intermittent, crampy, and frequently in the lower abdomen
- Associated with altered bowel habits
- May improve or worsen with defecation Defecation The normal process of elimination of fecal material from the rectum. Gastrointestinal Motility
- Abdominal tenderness is commonly present in the lower abdomen.
Abdominal distension or bloating Bloating Constipation
Mucousy stools
Extraintestinal symptoms:
- Somatic symptoms Somatic symptoms Major Depressive Disorder (e.g., generalized pain Pain An unpleasant sensation induced by noxious stimuli which are detected by nerve endings of nociceptive neurons. Pain: Types and Pathways, fatigue Fatigue The state of weariness following a period of exertion, mental or physical, characterized by a decreased capacity for work and reduced efficiency to respond to stimuli. Fibromyalgia)
- Dyspareunia Dyspareunia Recurrent genital pain occurring during, before, or after sexual intercourse in either the male or the female. Primary Ovarian Insufficiency
- Increased urinary frequency and urgency
Alarm features that suggest an alternative diagnosis and warrant further investigations:
- Weight loss Weight loss Decrease in existing body weight. Bariatric Surgery or anorexia Anorexia The lack or loss of appetite accompanied by an aversion to food and the inability to eat. It is the defining characteristic of the disorder anorexia nervosa. Anorexia Nervosa
- Fever Fever Fever is defined as a measured body temperature of at least 38°C (100.4°F). Fever is caused by circulating endogenous and/or exogenous pyrogens that increase levels of prostaglandin E2 in the hypothalamus. Fever is commonly associated with chills, rigors, sweating, and flushing of the skin. Fever
- Nocturnal diarrhea Diarrhea Diarrhea is defined as ≥ 3 watery or loose stools in a 24-hour period. There are a multitude of etiologies, which can be classified based on the underlying mechanism of disease. The duration of symptoms (acute or chronic) and characteristics of the stools (e.g., watery, bloody, steatorrheic, mucoid) can help guide further diagnostic evaluation. Diarrhea
- Anemia Anemia Anemia is a condition in which individuals have low Hb levels, which can arise from various causes. Anemia is accompanied by a reduced number of RBCs and may manifest with fatigue, shortness of breath, pallor, and weakness. Subtypes are classified by the size of RBCs, chronicity, and etiology. Anemia: Overview and Types
- Severe constipation Constipation Constipation is common and may be due to a variety of causes. Constipation is generally defined as bowel movement frequency < 3 times per week. Patients who are constipated often strain to pass hard stools. The condition is classified as primary (also known as idiopathic or functional constipation) or secondary, and as acute or chronic. Constipation or diarrhea Diarrhea Diarrhea is defined as ≥ 3 watery or loose stools in a 24-hour period. There are a multitude of etiologies, which can be classified based on the underlying mechanism of disease. The duration of symptoms (acute or chronic) and characteristics of the stools (e.g., watery, bloody, steatorrheic, mucoid) can help guide further diagnostic evaluation. Diarrhea
- Progressive symptoms
- Acute onset of disease, or onset in older patients Patients Individuals participating in the health care system for the purpose of receiving therapeutic, diagnostic, or preventive procedures. Clinician–Patient Relationship

Diagnosis

Criteria for diagnosis^[8,9,11,12]

Irritable bowel syndrome Irritable bowel syndrome Irritable bowel syndrome (IBS) is a functional bowel disease characterized by chronic abdominal pain and altered bowel habits without an identifiable organic cause. The etiology and pathophysiology of this disease are not well understood, and there are many factors that may contribute. Irritable Bowel Syndrome is a diagnosis of exclusion, but the Rome IV criteria Rome Iv Criteria Elimination Disorders (calculator) help provide a standardized diagnosis:

Recurrent abdominal pain Abdominal Pain Acute Abdomen that lasts at least 1 day per week during the previous 3 months
Onset of abdominal pain Abdominal Pain Acute Abdomen is ≥ 6 months prior to diagnosis.
Is associated with ≥ 2 of the following:
- Pain Pain An unpleasant sensation induced by noxious stimuli which are detected by nerve endings of nociceptive neurons. Pain: Types and Pathways related to defecation Defecation The normal process of elimination of fecal material from the rectum. Gastrointestinal Motility
- Change in stool frequency
- Change in stool appearance or form
Underlying organic disease (e.g., colon Colon The large intestines constitute the last portion of the digestive system. The large intestine consists of the cecum, appendix, colon (with ascending, transverse, descending, and sigmoid segments), rectum, and anal canal. The primary function of the colon is to remove water and compact the stool prior to expulsion from the body via the rectum and anal canal. Colon, Cecum, and Appendix: Anatomy cancer) has been excluded, especially in cases with warning signs (i.e., alarming features), which include:
- Age ≥ 50 years, without prior colon Colon The large intestines constitute the last portion of the digestive system. The large intestine consists of the cecum, appendix, colon (with ascending, transverse, descending, and sigmoid segments), rectum, and anal canal. The primary function of the colon is to remove water and compact the stool prior to expulsion from the body via the rectum and anal canal. Colon, Cecum, and Appendix: Anatomy cancer screening Screening Preoperative Care
- Overt GI bleeding ( melena Melena The black, tarry, foul-smelling feces that contain degraded blood. Gastrointestinal Bleeding, hematochezia Hematochezia Gastrointestinal Bleeding)
- Positive for fecal occult blood
- Iron Iron A metallic element with atomic symbol fe, atomic number 26, and atomic weight 55. 85. It is an essential constituent of hemoglobins; cytochromes; and iron-binding proteins. It plays a role in cellular redox reactions and in the transport of oxygen. Trace Elements deficiency anemia Anemia Anemia is a condition in which individuals have low Hb levels, which can arise from various causes. Anemia is accompanied by a reduced number of RBCs and may manifest with fatigue, shortness of breath, pallor, and weakness. Subtypes are classified by the size of RBCs, chronicity, and etiology. Anemia: Overview and Types
- Nocturnal passage of stools
- Unintentional weight loss Weight loss Decrease in existing body weight. Bariatric Surgery
- Family history Family History Adult Health Maintenance of inflammatory bowel disease or colorectal cancer Colorectal cancer Colorectal cancer (CRC) is the 2nd leading cause of cancer-related deaths in the United States. Colorectal cancer is a heterogeneous disease that arises from genetic and epigenetic abnormalities, with influence from environmental factors. Colorectal Cancer
- Recent changes in bowel habits
- A palpable abdominal mass Mass Three-dimensional lesion that occupies a space within the breast Imaging of the Breast or lymphadenopathy Lymphadenopathy Lymphadenopathy is lymph node enlargement (> 1 cm) and is benign and self-limited in most patients. Etiologies include malignancy, infection, and autoimmune disorders, as well as iatrogenic causes such as the use of certain medications. Generalized lymphadenopathy often indicates underlying systemic disease. Lymphadenopathy

Abnormal bowel movements^[9]

To define abnormal bowel movements, the Bristol Stool Form Scale Scale Dermatologic Examination is used. Types 1 and 2 (found in IBS-C) and 6 and 7 (found in IBS-D) are considered abnormal:

Type 1 Type 1 Spinal Muscular Atrophy: Separate hard lumps (difficult to pass)
Type 2: Sausage-shaped, but lumpy
Type 3 Type 3 Spinal Muscular Atrophy: Similar to a sausage but with cracks on its surface
Type 4 Type 4 Spinal Muscular Atrophy: Similar to a sausage or snake Snake Limbless reptiles of the suborder serpentes. Snakebites, smooth and soft
Type 5: Soft blobs with clear-cut edges (easily passed)
Type 6: Fluffy pieces with ragged edges, a mushy stool
Type 7: Watery, no solid pieces, entirely liquid

Tests to rule out organic disease

Work-up will be guided by the patient’s clinical presentation. Those who meet the diagnostic criteria and do not have other alarm features (or warning signs) require limited tests.^[8,9,10]

Laboratory tests:^[11,15]
- Complete blood count → screen for iron Iron A metallic element with atomic symbol fe, atomic number 26, and atomic weight 55. 85. It is an essential constituent of hemoglobins; cytochromes; and iron-binding proteins. It plays a role in cellular redox reactions and in the transport of oxygen. Trace Elements deficiency anemia Anemia Anemia is a condition in which individuals have low Hb levels, which can arise from various causes. Anemia is accompanied by a reduced number of RBCs and may manifest with fatigue, shortness of breath, pallor, and weakness. Subtypes are classified by the size of RBCs, chronicity, and etiology. Anemia: Overview and Types → malignancy Malignancy Hemothorax, celiac disease Celiac disease Celiac disease (also known as celiac sprue or gluten enteropathy) is an autoimmune reaction to gliadin, which is a component of gluten. Celiac disease is closely associated with HLA-DQ2 and HLA-DQ8. The immune response is localized to the proximal small intestine and causes the characteristic histologic findings of villous atrophy, crypt hyperplasia, and intraepithelial lymphocytosis. Celiac Disease
- Fecal calprotectin Calprotectin Irritable Bowel Syndrome or fecal lactoferrin → screen for inflammatory bowel disease (IBD)
- CRP → screen for IBD
- Immunoglobulin A ( IgA IgA Represents 15-20% of the human serum immunoglobulins, mostly as the 4-chain polymer in humans or dimer in other mammals. Secretory iga is the main immunoglobulin in secretions. Immunoglobulins: Types and Functions) tissue transglutaminase or endomysial antibodies Antibodies Immunoglobulins (Igs), also known as antibodies, are glycoprotein molecules produced by plasma cells that act in immune responses by recognizing and binding particular antigens. The various Ig classes are IgG (the most abundant), IgM, IgE, IgD, and IgA, which differ in their biologic features, structure, target specificity, and distribution. Immunoglobulins: Types and Functions → screen for celiac disease Celiac disease Celiac disease (also known as celiac sprue or gluten enteropathy) is an autoimmune reaction to gliadin, which is a component of gluten. Celiac disease is closely associated with HLA-DQ2 and HLA-DQ8. The immune response is localized to the proximal small intestine and causes the characteristic histologic findings of villous atrophy, crypt hyperplasia, and intraepithelial lymphocytosis. Celiac Disease
- Thyroid-stimulating hormone Thyroid-stimulating hormone A glycoprotein hormone secreted by the adenohypophysis. Thyrotropin stimulates thyroid gland by increasing the iodide transport, synthesis and release of thyroid hormones (thyroxine and triiodothyronine). Thyroid Hormones → hyperthyroidism Hyperthyroidism Hypersecretion of thyroid hormones from the thyroid gland. Elevated levels of thyroid hormones increase basal metabolic rate. Thyrotoxicosis and Hyperthyroidism or hypothyroidism Hypothyroidism Hypothyroidism is a condition characterized by a deficiency of thyroid hormones. Iodine deficiency is the most common cause worldwide, but Hashimoto’s disease (autoimmune thyroiditis) is the leading cause in non-iodine-deficient regions. Hypothyroidism
- Stool test for Giardia Giardia A genus of flagellate intestinal eukaryotes parasitic in various vertebrates, including humans. Characteristics include the presence of four pairs of flagella arising from a complicated system of axonemes and cysts that are ellipsoidal to ovoidal in shape. Nitroimidazoles (only in patients Patients Individuals participating in the health care system for the purpose of receiving therapeutic, diagnostic, or preventive procedures. Clinician–Patient Relationship with IBS-D if there is a high pretest probability Probability Probability is a mathematical tool used to study randomness and provide predictions about the likelihood of something happening. There are several basic rules of probability that can be used to help determine the probability of multiple events happening together, separately, or sequentially. Basics of Probability of infection)
Abdominal radiography:
- Performed in patients Patients Individuals participating in the health care system for the purpose of receiving therapeutic, diagnostic, or preventive procedures. Clinician–Patient Relationship with constipation Constipation Constipation is common and may be due to a variety of causes. Constipation is generally defined as bowel movement frequency < 3 times per week. Patients who are constipated often strain to pass hard stools. The condition is classified as primary (also known as idiopathic or functional constipation) or secondary, and as acute or chronic. Constipation
- Rules out stool impaction
- Determines the severity of constipation Constipation Constipation is common and may be due to a variety of causes. Constipation is generally defined as bowel movement frequency < 3 times per week. Patients who are constipated often strain to pass hard stools. The condition is classified as primary (also known as idiopathic or functional constipation) or secondary, and as acute or chronic. Constipation
Colonoscopy Colonoscopy Endoscopic examination, therapy or surgery of the luminal surface of the colon. Colorectal Cancer Screening with biopsy Biopsy Removal and pathologic examination of specimens from the living body. Ewing Sarcoma:
- All patients Patients Individuals participating in the health care system for the purpose of receiving therapeutic, diagnostic, or preventive procedures. Clinician–Patient Relationship should have age-appropriate cancer screening Screening Preoperative Care.
- The procedure is generally reserved for those with warning features and diarrhea Diarrhea Diarrhea is defined as ≥ 3 watery or loose stools in a 24-hour period. There are a multitude of etiologies, which can be classified based on the underlying mechanism of disease. The duration of symptoms (acute or chronic) and characteristics of the stools (e.g., watery, bloody, steatorrheic, mucoid) can help guide further diagnostic evaluation. Diarrhea to rule out:
  - Malignancy Malignancy Hemothorax
  - IBD
  - Microscopic colitis Colitis Inflammation of the colon section of the large intestine, usually with symptoms such as diarrhea (often with blood and mucus), abdominal pain, and fever. Pseudomembranous Colitis^[11]
Additional studies:^[8,11]
- Abdominal CT: performed in those with a suspected structural lesion
- Anorectal physiology tests (such as manometry Manometry Measurement of the pressure or tension of liquids or gases with a manometer. Achalasia) performed in those with:
  - Fecal incontinence Fecal incontinence Failure of voluntary control of the anal sphincters, with involuntary passage of feces and flatus. Pediatric Constipation
  - Chronic constipation Constipation Constipation is common and may be due to a variety of causes. Constipation is generally defined as bowel movement frequency < 3 times per week. Patients who are constipated often strain to pass hard stools. The condition is classified as primary (also known as idiopathic or functional constipation) or secondary, and as acute or chronic. Constipation
  - Obstructive defecation Defecation The normal process of elimination of fecal material from the rectum. Gastrointestinal Motility (paradoxical anal contraction on straining)
  - Suspected pelvic floor Pelvic floor Soft tissue formed mainly by the pelvic diaphragm, which is composed of the two levator ani and two coccygeus muscles. The pelvic diaphragm lies just below the pelvic aperture (outlet) and separates the pelvic cavity from the perineum. It extends between the pubic bone anteriorly and the coccyx posteriorly. Vagina, Vulva, and Pelvic Floor: Anatomy disorder
- Pelvic exam with transvaginal and transabdominal ultrasonography:
  - Consider in postmenopausal women with new-onset constipation Constipation Constipation is common and may be due to a variety of causes. Constipation is generally defined as bowel movement frequency < 3 times per week. Patients who are constipated often strain to pass hard stools. The condition is classified as primary (also known as idiopathic or functional constipation) or secondary, and as acute or chronic. Constipation to rule out ovarian cancer Ovarian cancer Ovarian cancer is a malignant tumor arising from the ovarian tissue and is classified according to the type of tissue from which it originates. The 3 major types of ovarian cancer are epithelial ovarian carcinomas (EOCs), ovarian germ cell tumors (OGCTs), and sex cord-stromal tumors (SCSTs). Ovarian Cancer
  - Other potential symptoms of ovarian cancer Ovarian cancer Ovarian cancer is a malignant tumor arising from the ovarian tissue and is classified according to the type of tissue from which it originates. The 3 major types of ovarian cancer are epithelial ovarian carcinomas (EOCs), ovarian germ cell tumors (OGCTs), and sex cord-stromal tumors (SCSTs). Ovarian Cancer include lower abdominal pain Abdominal Pain Acute Abdomen, bloating Bloating Constipation, and distention.
- Rule out bile Bile An emulsifying agent produced in the liver and secreted into the duodenum. Its composition includes bile acids and salts; cholesterol; and electrolytes. It aids digestion of fats in the duodenum. Gallbladder and Biliary Tract: Anatomy acid diarrhea Diarrhea Diarrhea is defined as ≥ 3 watery or loose stools in a 24-hour period. There are a multitude of etiologies, which can be classified based on the underlying mechanism of disease. The duration of symptoms (acute or chronic) and characteristics of the stools (e.g., watery, bloody, steatorrheic, mucoid) can help guide further diagnostic evaluation. Diarrhea in those presenting with IBS-D and cholecystectomy Cholecystectomy Cholecystectomy is a surgical procedure performed with the goal of resecting and extracting the gallbladder. It is one of the most common abdominal surgeries performed in the Western world. Cholecystectomy is performed for symptomatic cholelithiasis, cholecystitis, gallbladder polyps > 0.5 cm, porcelain gallbladder, choledocholithiasis and gallstone pancreatitis, and rarely, for gallbladder cancer. Cholecystectomy.^[13]
  - Therapeutic trial of bile Bile An emulsifying agent produced in the liver and secreted into the duodenum. Its composition includes bile acids and salts; cholesterol; and electrolytes. It aids digestion of fats in the duodenum. Gallbladder and Biliary Tract: Anatomy acid sequestrant (done in the US)
  - In the UK, 23-seleno-25-homotaurocholic acid scanning (not available in the US) is performed.

Management

Management may vary depending on practice location. The following information is based on US and UK literature and guidelines for adult patients Patients Individuals participating in the health care system for the purpose of receiving therapeutic, diagnostic, or preventive procedures. Clinician–Patient Relationship.

General measures^[10–12]

Reassurance Reassurance Clinician–Patient Relationship, education, and support
Involve the patient in the treatment process.
Encourage physical activity.

Dietary modifications^{[8,10–12,15]}

Most patients Patients Individuals participating in the health care system for the purpose of receiving therapeutic, diagnostic, or preventive procedures. Clinician–Patient Relationship can follow a normal diet.
May exclude gas-producing foods (e.g., beans, brussel sprouts)
Low-FODMAP (fermentable oligosaccharides Oligosaccharides Carbohydrates consisting of between two (disaccharides) and ten monosaccharides connected by either an alpha- or beta-glycosidic link. They are found throughout nature in both the free and bound form. Basics of Carbohydrates, disaccharides Disaccharides Oligosaccharides containing two monosaccharide units linked by a glycosidic bond. Basics of Carbohydrates, monosaccharides Monosaccharides Single chain carbohydrates that are the most basic units of carbohydrates. They are typically colorless crystalline substances with a sweet taste and have the same general formula CNH2NON. Basics of Carbohydrates, and polyols) diet
- Trial of a low FODMAP diet should be supervised by a trained dietitian.
- The FODMAP diet leads to ↑ GI water secretion Secretion Coagulation Studies and fermentation in the colon Colon The large intestines constitute the last portion of the digestive system. The large intestine consists of the cecum, appendix, colon (with ascending, transverse, descending, and sigmoid segments), rectum, and anal canal. The primary function of the colon is to remove water and compact the stool prior to expulsion from the body via the rectum and anal canal. Colon, Cecum, and Appendix: Anatomy → ↑ short-chain fatty acids Short-chain fatty acids Digestion and Absorption and gases → distention and meal-triggered symptoms
- Responders will show symptom improvement within 2‒6 weeks.
Dietary or supplemental fiber:
- Soluble fiber (psyllium/ispaghula) improves both IBS-D and IBS-C.
- Avoid insoluble fiber (wheat bran), which can exacerbate pain Pain An unpleasant sensation induced by noxious stimuli which are detected by nerve endings of nociceptive neurons. Pain: Types and Pathways and bloating Bloating Constipation.
Avoid/restrict alcohol and caffeine Caffeine A methylxanthine naturally occurring in some beverages and also used as a pharmacological agent. Caffeine’s most notable pharmacological effect is as a central nervous system stimulant, increasing alertness and producing agitation. Several cellular actions of caffeine have been observed, but it is not entirely clear how each contributes to its pharmacological profile. Among the most important are inhibition of cyclic nucleotide phosphodiesterases, antagonism of adenosine receptors, and modulation of intracellular calcium handling. Stimulants.
Maintain proper hydration.

Pharmacologic agents, based on symptoms

IBS-D:

Loperamide Loperamide One of the long-acting synthetic antidiarrheals; it is not significantly absorbed from the gut, and has no effect on the adrenergic system or central nervous system, but may antagonize histamine and interfere with acetylcholine release locally. Antidiarrheal Drugs ( antidiarrheal Antidiarrheal Antidiarrheal agents include several drug classes, including opioid agonists, somatostatin analogues, adsorbents, and bile acid sequestrants. These medications mainly work through antimotility and/or antisecretory effects. Antidiarrheal Drugs):^[7,10–12]
- Reasonable 1st-line treatment
- Acts on the μ-opioid receptors Receptors Receptors are proteins located either on the surface of or within a cell that can bind to signaling molecules known as ligands (e.g., hormones) and cause some type of response within the cell. Receptors ( opioid Opioid Compounds with activity like opiate alkaloids, acting at opioid receptors. Properties include induction of analgesia or narcosis. Constipation receptor Receptor Receptors are proteins located either on the surface of or within a cell that can bind to signaling molecules known as ligands (e.g., hormones) and cause some type of response within the cell. Receptors agonist):^[8]
- ↑ Intestinal transit time, ↓ peristalsis Peristalsis A movement, caused by sequential muscle contraction, that pushes the contents of the intestines or other tubular organs in one direction. Gastrointestinal Motility and secretion Secretion Coagulation Studies
- Adverse effects: abdominal pain Abdominal Pain Acute Abdomen, constipation Constipation Constipation is common and may be due to a variety of causes. Constipation is generally defined as bowel movement frequency < 3 times per week. Patients who are constipated often strain to pass hard stools. The condition is classified as primary (also known as idiopathic or functional constipation) or secondary, and as acute or chronic. Constipation, bloating Bloating Constipation
- Titrate slowly to reduce ill effects.
Bile acid sequestrants Bile Acid Sequestrants Antidiarrheal Drugs:^[13]
- Options:
  - Cholestyramine Cholestyramine A strongly basic anion exchange resin whose main constituent is polystyrene trimethylbenzylammonium cl(-) anion. Lipid Control Drugs
  - Colesevelam Colesevelam An allylamine derivative that binds bile acids in the intestine and is used as an anticholesteremic agent in the treatment of hypercholesterolemia and hyperlipidemias. Lipid Control Drugs
- IBS-D may have idiopathic Idiopathic Dermatomyositis bile Bile An emulsifying agent produced in the liver and secreted into the duodenum. Its composition includes bile acids and salts; cholesterol; and electrolytes. It aids digestion of fats in the duodenum. Gallbladder and Biliary Tract: Anatomy acid malabsorption Malabsorption General term for a group of malnutrition syndromes caused by failure of normal intestinal absorption of nutrients. Malabsorption and Maldigestion (I-BAM) contributing to symptoms.
- Use is controversial in IBD.
- 10% of patients Patients Individuals participating in the health care system for the purpose of receiving therapeutic, diagnostic, or preventive procedures. Clinician–Patient Relationship with IBS-D have severe I-BAM, and 32% have moderately severe I-BAM.
- An option for persistent diarrhea Persistent Diarrhea Entamoeba spp./Amebiasis
5-Hydroxytryptamine 5-hydroxytryptamine A biochemical messenger and regulator, synthesized from the essential amino acid l-tryptophan. In humans it is found primarily in the central nervous system, gastrointestinal tract, and blood platelets. Serotonin mediates several important physiological functions including neurotransmission, gastrointestinal motility, hemostasis, and cardiovascular integrity. Receptors and Neurotransmitters of the CNS 3 (5-HT3) receptor Receptor Receptors are proteins located either on the surface of or within a cell that can bind to signaling molecules known as ligands (e.g., hormones) and cause some type of response within the cell. Receptors antagonists:^[8,11,14]
- Options:
  - Ondansetron Ondansetron A competitive serotonin type 3 receptor antagonist. It is effective in the treatment of nausea and vomiting caused by cytotoxic chemotherapy drugs, including cisplatin, and has reported anxiolytic and neuroleptic properties. Antiemetics
  - Alosetron
- Slow colonic transit and decrease secretion Secretion Coagulation Studies
- Alosetron:
  - Restricted to women with severe IBS-D in a risk-management program for whom conventional therapy has failed
  - Serious adverse effects: constipation Constipation Constipation is common and may be due to a variety of causes. Constipation is generally defined as bowel movement frequency < 3 times per week. Patients who are constipated often strain to pass hard stools. The condition is classified as primary (also known as idiopathic or functional constipation) or secondary, and as acute or chronic. Constipation and ischemic colitis Ischemic colitis Inflammation of the colon due to colonic ischemia resulting from alterations in systemic circulation or local vasculature. Large Bowel Obstruction
  - Can improve diarrhea Diarrhea Diarrhea is defined as ≥ 3 watery or loose stools in a 24-hour period. There are a multitude of etiologies, which can be classified based on the underlying mechanism of disease. The duration of symptoms (acute or chronic) and characteristics of the stools (e.g., watery, bloody, steatorrheic, mucoid) can help guide further diagnostic evaluation. Diarrhea and abdominal pain Abdominal Pain Acute Abdomen
- Ondansetron Ondansetron A competitive serotonin type 3 receptor antagonist. It is effective in the treatment of nausea and vomiting caused by cytotoxic chemotherapy drugs, including cisplatin, and has reported anxiolytic and neuroleptic properties. Antiemetics:
  - Established safety profile
  - Improves diarrhea Diarrhea Diarrhea is defined as ≥ 3 watery or loose stools in a 24-hour period. There are a multitude of etiologies, which can be classified based on the underlying mechanism of disease. The duration of symptoms (acute or chronic) and characteristics of the stools (e.g., watery, bloody, steatorrheic, mucoid) can help guide further diagnostic evaluation. Diarrhea but not abdominal pain Abdominal Pain Acute Abdomen
Eluxadoline:^[7,8,11,15]
- Mixed opioid Opioid Compounds with activity like opiate alkaloids, acting at opioid receptors. Properties include induction of analgesia or narcosis. Constipation receptor Receptor Receptors are proteins located either on the surface of or within a cell that can bind to signaling molecules known as ligands (e.g., hormones) and cause some type of response within the cell. Receptors drug: μ-opioid receptor Receptor Receptors are proteins located either on the surface of or within a cell that can bind to signaling molecules known as ligands (e.g., hormones) and cause some type of response within the cell. Receptors agonist, κ-opioid receptor Receptor Receptors are proteins located either on the surface of or within a cell that can bind to signaling molecules known as ligands (e.g., hormones) and cause some type of response within the cell. Receptors agonist and ẟ-opioid receptor Receptor Receptors are proteins located either on the surface of or within a cell that can bind to signaling molecules known as ligands (e.g., hormones) and cause some type of response within the cell. Receptors antagonist
- 2nd-line option for severe IBS-D (not responding to initial treatments)
- Effective in controlling diarrhea Diarrhea Diarrhea is defined as ≥ 3 watery or loose stools in a 24-hour period. There are a multitude of etiologies, which can be classified based on the underlying mechanism of disease. The duration of symptoms (acute or chronic) and characteristics of the stools (e.g., watery, bloody, steatorrheic, mucoid) can help guide further diagnostic evaluation. Diarrhea, but less effective at relieving abdominal pain Abdominal Pain Acute Abdomen
- Contraindicated in patients Patients Individuals participating in the health care system for the purpose of receiving therapeutic, diagnostic, or preventive procedures. Clinician–Patient Relationship:
  - Without a gallbladder Gallbladder The gallbladder is a pear-shaped sac, located directly beneath the liver, that sits on top of the superior part of the duodenum. The primary functions of the gallbladder include concentrating and storing up to 50 mL of bile. Gallbladder and Biliary Tract: Anatomy
  - With alcohol abuse (> 3 drinks per day) or severe liver Liver The liver is the largest gland in the human body. The liver is found in the superior right quadrant of the abdomen and weighs approximately 1.5 kilograms. Its main functions are detoxification, metabolism, nutrient storage (e.g., iron and vitamins), synthesis of coagulation factors, formation of bile, filtration, and storage of blood. Liver: Anatomy impairment
  - Pancreatitis Pancreatitis Inflammation of the pancreas. Pancreatitis is classified as acute unless there are computed tomographic or endoscopic retrograde cholangiopancreatographic findings of chronic pancreatitis. The two most common forms of acute pancreatitis are alcoholic pancreatitis and gallstone pancreatitis. Acute Pancreatitis
  - Sphincter of Oddi spasm
- Adverse effects: constipation Constipation Constipation is common and may be due to a variety of causes. Constipation is generally defined as bowel movement frequency < 3 times per week. Patients who are constipated often strain to pass hard stools. The condition is classified as primary (also known as idiopathic or functional constipation) or secondary, and as acute or chronic. Constipation, nausea Nausea An unpleasant sensation in the stomach usually accompanied by the urge to vomit. Common causes are early pregnancy, sea and motion sickness, emotional stress, intense pain, food poisoning, and various enteroviruses. Antiemetics, abdominal pain Abdominal Pain Acute Abdomen
Rifaximin Rifaximin A synthetic rifamycin derivative and anti-bacterial agent that is used for the treatment of gastroenteritis caused by Escherichia coli infections. It may also be used in the treatment of hepatic encephalopathy. Hepatic Encephalopathy:^{[7,8,11,12,15]}
- Oral, nonabsorbable antibiotic (active against gram-negative and gram-positive Gram-Positive Penicillins aerobic and anaerobic bacteria Anaerobic Bacteria Nitroimidazoles)
- Helps with diarrhea Diarrhea Diarrhea is defined as ≥ 3 watery or loose stools in a 24-hour period. There are a multitude of etiologies, which can be classified based on the underlying mechanism of disease. The duration of symptoms (acute or chronic) and characteristics of the stools (e.g., watery, bloody, steatorrheic, mucoid) can help guide further diagnostic evaluation. Diarrhea and bloating Bloating Constipation
- Retreatment up to twice with the same regimen can be given if symptoms recur.
- Adverse effects: upper respiratory infection Upper respiratory infection Rhinitis, nausea Nausea An unpleasant sensation in the stomach usually accompanied by the urge to vomit. Common causes are early pregnancy, sea and motion sickness, emotional stress, intense pain, food poisoning, and various enteroviruses. Antiemetics, urinary tract Urinary tract The urinary tract is located in the abdomen and pelvis and consists of the kidneys, ureters, urinary bladder, and urethra. The structures permit the excretion of urine from the body. Urine flows from the kidneys through the ureters to the urinary bladder and out through the urethra. Urinary Tract: Anatomy infection

**Table: Medications for IBS-D^[7,11,13,14]**
Medication	Typical dose (adult)
Loperamide Loperamide One of the long-acting synthetic antidiarrheals; it is not significantly absorbed from the gut, and has no effect on the adrenergic system or central nervous system, but may antagonize histamine and interfere with acetylcholine release locally. Antidiarrheal Drugs	Initial dose: 4 mg Followed by: 2 mg after each loose stool Maximum: 16 mg/day Maintenance: usually 4–8 mg total per day
Cholestyramine Cholestyramine A strongly basic anion exchange resin whose main constituent is polystyrene trimethylbenzylammonium cl(-) anion. Lipid Control Drugs	2–4 g/day
Colesevelam Colesevelam An allylamine derivative that binds bile acids in the intestine and is used as an anticholesteremic agent in the treatment of hypercholesterolemia and hyperlipidemias. Lipid Control Drugs	3.75 g daily
Ondansetron Ondansetron A competitive serotonin type 3 receptor antagonist. It is effective in the treatment of nausea and vomiting caused by cytotoxic chemotherapy drugs, including cisplatin, and has reported anxiolytic and neuroleptic properties. Antiemetics	4–8 mg up to 3 times daily
Alosetron	0.5 mg 2 times daily
Eluxadoline	100 mg 2 times daily Can decrease to 75 mg 2 times daily if higher dose not tolerated
Rifaximin Rifaximin A synthetic rifamycin derivative and anti-bacterial agent that is used for the treatment of gastroenteritis caused by Escherichia coli infections. It may also be used in the treatment of hepatic encephalopathy. Hepatic Encephalopathy	550 mg 3 times daily for 14 days

IBS-C:^[6,8,11]

Polyethylene glycol Polyethylene Glycol Laxatives (osmotic laxative Laxative Agents that produce a soft formed stool, and relax and loosen the bowels, typically used over a protracted period, to relieve constipation. Hypokalemia):
- 1st-line therapy (over-the-counter) for occasional constipation Constipation Constipation is common and may be due to a variety of causes. Constipation is generally defined as bowel movement frequency < 3 times per week. Patients who are constipated often strain to pass hard stools. The condition is classified as primary (also known as idiopathic or functional constipation) or secondary, and as acute or chronic. Constipation, though efficacy in relieving IBS-C abdominal pain Abdominal Pain Acute Abdomen has not been proven^[15]
- Long-chain polymer of ethylene oxide
- Inexpensive, widely available, with a good safety profile
- Adverse effect: abdominal pain Abdominal Pain Acute Abdomen
Lubiprostone ( chloride Chloride Inorganic compounds derived from hydrochloric acid that contain the Cl- ion. Electrolytes channel activator):
- 2nd-line treatment
- ↑ Chloride-rich intestinal fluid secretion Secretion Coagulation Studies
- Adverse effect: nausea Nausea An unpleasant sensation in the stomach usually accompanied by the urge to vomit. Common causes are early pregnancy, sea and motion sickness, emotional stress, intense pain, food poisoning, and various enteroviruses. Antiemetics
Linaclotide (guanylate cyclase-C [GC-C] agonist):
- 2nd-line treatment
- Nonabsorbed 14-amino acid peptide → stimulates the GC-C receptor Receptor Receptors are proteins located either on the surface of or within a cell that can bind to signaling molecules known as ligands (e.g., hormones) and cause some type of response within the cell. Receptors on enterocytes → intestinal chloride Chloride Inorganic compounds derived from hydrochloric acid that contain the Cl- ion. Electrolytes and bicarbonate Bicarbonate Inorganic salts that contain the -HCO3 radical. They are an important factor in determining the ph of the blood and the concentration of bicarbonate ions is regulated by the kidney. Levels in the blood are an index of the alkali reserve or buffering capacity. Electrolytes secretion Secretion Coagulation Studies
- Adverse effect: diarrhea Diarrhea Diarrhea is defined as ≥ 3 watery or loose stools in a 24-hour period. There are a multitude of etiologies, which can be classified based on the underlying mechanism of disease. The duration of symptoms (acute or chronic) and characteristics of the stools (e.g., watery, bloody, steatorrheic, mucoid) can help guide further diagnostic evaluation. Diarrhea
Plecanatide (guanylate cyclase-C [GC-C] agonist):
- 2nd-line treatment
- 16-amino acid peptide → stimulates the GC-C- receptor Receptor Receptors are proteins located either on the surface of or within a cell that can bind to signaling molecules known as ligands (e.g., hormones) and cause some type of response within the cell. Receptors on enterocytes → fluid and electrolyte secretion Secretion Coagulation Studies
- Adverse effect: diarrhea Diarrhea Diarrhea is defined as ≥ 3 watery or loose stools in a 24-hour period. There are a multitude of etiologies, which can be classified based on the underlying mechanism of disease. The duration of symptoms (acute or chronic) and characteristics of the stools (e.g., watery, bloody, steatorrheic, mucoid) can help guide further diagnostic evaluation. Diarrhea
Tegaserod ( 5-hydroxytryptamine 5-hydroxytryptamine A biochemical messenger and regulator, synthesized from the essential amino acid l-tryptophan. In humans it is found primarily in the central nervous system, gastrointestinal tract, and blood platelets. Serotonin mediates several important physiological functions including neurotransmission, gastrointestinal motility, hemostasis, and cardiovascular integrity. Receptors and Neurotransmitters of the CNS 4 (5-HT4) receptor Receptor Receptors are proteins located either on the surface of or within a cell that can bind to signaling molecules known as ligands (e.g., hormones) and cause some type of response within the cell. Receptors partial agonist):
- Stimulates GI motility GI Motility The primary functions of the GI tract are digestion and absorption, which require coordinated contractions of the smooth muscles present in the GI tract. Peristaltic waves, segmentation contractions, and the migrating motor complex are all important contraction patterns that help to mix contents, get them in contact with the intestinal walls, and propel material down the tract at appropriate times and in appropriate amounts. Gastrointestinal Motility and ↑ fluid in the intestine
- Was previously withdrawn from the market, but now with limited use (safety in men or women > 65 not established; ↑ cardiovascular event)
- Use only for women < 65 years without a history of cardiovascular ischemic events (such as myocardial infarction Myocardial infarction MI is ischemia and death of an area of myocardial tissue due to insufficient blood flow and oxygenation, usually from thrombus formation on a ruptured atherosclerotic plaque in the epicardial arteries. Clinical presentation is most commonly with chest pain, but women and patients with diabetes may have atypical symptoms. Myocardial Infarction, stroke)
- Other adverse effects: diarrhea Diarrhea Diarrhea is defined as ≥ 3 watery or loose stools in a 24-hour period. There are a multitude of etiologies, which can be classified based on the underlying mechanism of disease. The duration of symptoms (acute or chronic) and characteristics of the stools (e.g., watery, bloody, steatorrheic, mucoid) can help guide further diagnostic evaluation. Diarrhea, headaches
Tenapanor:
- Other therapy options have failed
- ↓ Sodium Sodium A member of the alkali group of metals. It has the atomic symbol na, atomic number 11, and atomic weight 23. Hyponatremia absorption Absorption Absorption involves the uptake of nutrient molecules and their transfer from the lumen of the GI tract across the enterocytes and into the interstitial space, where they can be taken up in the venous or lymphatic circulation. Digestion and Absorption, ↑ water secretion Secretion Coagulation Studies (due to inhibition of the gastrointestinal sodium Sodium A member of the alkali group of metals. It has the atomic symbol na, atomic number 11, and atomic weight 23. Hyponatremia/hydrogen exchanger isoform 3)
- Has antinociceptive effects
- Adverse effects: abdominal pain Abdominal Pain Acute Abdomen, nausea Nausea An unpleasant sensation in the stomach usually accompanied by the urge to vomit. Common causes are early pregnancy, sea and motion sickness, emotional stress, intense pain, food poisoning, and various enteroviruses. Antiemetics, diarrhea Diarrhea Diarrhea is defined as ≥ 3 watery or loose stools in a 24-hour period. There are a multitude of etiologies, which can be classified based on the underlying mechanism of disease. The duration of symptoms (acute or chronic) and characteristics of the stools (e.g., watery, bloody, steatorrheic, mucoid) can help guide further diagnostic evaluation. Diarrhea

**Table: Medications for IBS-C^[6,11]**
Medication	Typical dose (adult)
Lubiprostone	8 μg 2 times daily (for adult women)
Linaclotide	290 μg daily
Plecanatide	3 mg daily
Tegaserod	6 mg 2 times daily
Tenapanor	50 mg 2 times daily

Abdominal pain Abdominal Pain Acute Abdomen and bloating Bloating Constipation:

Peppermint oil Peppermint Oil Antispasmodics:^[8,11]
- ↑ Smooth muscle relaxation (blocks calcium Calcium A basic element found in nearly all tissues. It is a member of the alkaline earth family of metals with the atomic symbol ca, atomic number 20, and atomic weight 40. Calcium is the most abundant mineral in the body and combines with phosphorus to form calcium phosphate in the bones and teeth. It is essential for the normal functioning of nerves and muscles and plays a role in blood coagulation (as factor IV) and in many enzymatic processes. Electrolytes channels Channels The Cell: Cell Membrane)
- ↓ Abdominal pain Abdominal Pain Acute Abdomen
- Adverse effect: gastroesophageal reflux
Antispasmodic Antispasmodic Antispasmodics are a group of medications used to reduce excessive GI smooth muscle contractility and spasm. These medications may be helpful in those with abdominal pain due to conditions such as irritable bowel syndrome, although their efficacy is controversial. Antispasmodics agents:^[7,11,12]
- Options:
  - Hyoscyamine Hyoscyamine The 3(s)-endo isomer of atropine. Anticholinergic Drugs 0.125–0.25 mg 3–4 times a day as needed
  - Dicyclomine Dicyclomine A muscarinic antagonist used as an antispasmodic and in urinary incontinence. It has little effect on glandular secretion or the cardiovascular system. It does have some local anesthetic properties and is used in gastrointestinal, biliary, and urinary tract spasms. Anticholinergic Drugs 20 mg up to 4 times a day as needed
- ↓ Smooth muscle contraction Smooth muscle contraction Smooth muscle is primarily found in the walls of hollow structures and some visceral organs, including the walls of the vasculature, GI, respiratory, and genitourinary tracts. Smooth muscle contracts more slowly and is regulated differently than skeletal muscle. Smooth muscle can be stimulated by nerve impulses, hormones, metabolic factors (like pH, CO2 or O2 levels), its own intrinsic pacemaker ability, or even mechanical stretch. Smooth Muscle Contraction and visceral hypersensitivity
- Short-term relief of abdominal pain Abdominal Pain Acute Abdomen
- Note: The American College of Gastroenterology (ACG) recommends against using antispasmodics for treatment of IBS IBS Irritable bowel syndrome (IBS) is a functional bowel disease characterized by chronic abdominal pain and altered bowel habits without an identifiable organic cause. The etiology and pathophysiology of this disease are not well understood, and there are many factors that may contribute. Irritable Bowel Syndrome global symptoms.
- Adverse effects: dry mouth, dizziness Dizziness An imprecise term which may refer to a sense of spatial disorientation, motion of the environment, or lightheadedness. Lateral Medullary Syndrome (Wallenberg Syndrome), blurred vision Blurred Vision Retinal Detachment
Tricyclic antidepressants Tricyclic antidepressants Tricyclic antidepressants (TCAs) are a class of medications used in the management of mood disorders, primarily depression. These agents, named after their 3-ring chemical structure, act via reuptake inhibition of neurotransmitters (particularly norepinephrine and serotonin) in the brain. Tricyclic Antidepressants ( TCAs TCAs Tricyclic antidepressants (TCAs) are a class of medications used in the management of mood disorders, primarily depression. These agents, named after their 3-ring chemical structure, act via reuptake inhibition of neurotransmitters (particularly norepinephrine and serotonin) in the brain. Tricyclic Antidepressants):^{[7,8,10,11,15]}
- Options:
  - Amitriptyline Amitriptyline Tricyclic antidepressant with anticholinergic and sedative properties. It appears to prevent the reuptake of norepinephrine and serotonin at nerve terminals, thus potentiating the action of these neurotransmitters. Amitriptyline also appears to antagonize cholinergic and alpha-1 adrenergic responses to bioactive amines. Tricyclic Antidepressants
  - Nortriptyline Nortriptyline A metabolite of amitriptyline that is also used as an antidepressant agent. Nortriptyline is used in major depression, dysthymia, and atypical depressions. Tricyclic Antidepressants
- Dosing for both:
  - Start low, at 10 mg/day (at bedtime)
  - Gradually increase to 50‒100 mg/day ( amitriptyline Amitriptyline Tricyclic antidepressant with anticholinergic and sedative properties. It appears to prevent the reuptake of norepinephrine and serotonin at nerve terminals, thus potentiating the action of these neurotransmitters. Amitriptyline also appears to antagonize cholinergic and alpha-1 adrenergic responses to bioactive amines. Tricyclic Antidepressants) or 25‒75 mg/day ( nortriptyline Nortriptyline A metabolite of amitriptyline that is also used as an antidepressant agent. Nortriptyline is used in major depression, dysthymia, and atypical depressions. Tricyclic Antidepressants)
- Gut-brain modulators → improve visceral and central pain Pain An unpleasant sensation induced by noxious stimuli which are detected by nerve endings of nociceptive neurons. Pain: Types and Pathways by acting on norepinephrine Norepinephrine Precursor of epinephrine that is secreted by the adrenal medulla and is a widespread central and autonomic neurotransmitter. Norepinephrine is the principal transmitter of most postganglionic sympathetic fibers, and of the diffuse projection system in the brain that arises from the locus ceruleus. Receptors and Neurotransmitters of the CNS and dopaminergic receptors Receptors Receptors are proteins located either on the surface of or within a cell that can bind to signaling molecules known as ligands (e.g., hormones) and cause some type of response within the cell. Receptors
- ↓ Intestinal transit (use with caution in constipation Constipation Constipation is common and may be due to a variety of causes. Constipation is generally defined as bowel movement frequency < 3 times per week. Patients who are constipated often strain to pass hard stools. The condition is classified as primary (also known as idiopathic or functional constipation) or secondary, and as acute or chronic. Constipation)
- Adverse effects: dry mouth, constipation Constipation Constipation is common and may be due to a variety of causes. Constipation is generally defined as bowel movement frequency < 3 times per week. Patients who are constipated often strain to pass hard stools. The condition is classified as primary (also known as idiopathic or functional constipation) or secondary, and as acute or chronic. Constipation, drowsiness
Probiotics:^[8,11]
- Not given routinely, but ↓ abdominal pain Abdominal Pain Acute Abdomen
- No specific strain or species recommended.

Other recommendations:

Selective serotonin reuptake inhibitors Selective Serotonin Reuptake Inhibitors Serotonin Reuptake Inhibitors and Similar Antidepressants ( SSRIs SSRIs Serotonin Reuptake Inhibitors and Similar Antidepressants); recommendations vary:
- The British Society of Gastroenterology issued a weak recommendation for SSRIs SSRIs Serotonin Reuptake Inhibitors and Similar Antidepressants as a 2nd-line treatment.^[11]
- The National Institute for Health and Care Excellence (NICE) and the World Gastroenterology Organisation mention SSRI use only for resistant symptoms (no clear indication or long-term data for use in IBS IBS Irritable bowel syndrome (IBS) is a functional bowel disease characterized by chronic abdominal pain and altered bowel habits without an identifiable organic cause. The etiology and pathophysiology of this disease are not well understood, and there are many factors that may contribute. Irritable Bowel Syndrome).^[10,12]
- The American Gastroenterology Association (AGA) does NOT recommend SSRIs SSRIs Serotonin Reuptake Inhibitors and Similar Antidepressants for IBS IBS Irritable bowel syndrome (IBS) is a functional bowel disease characterized by chronic abdominal pain and altered bowel habits without an identifiable organic cause. The etiology and pathophysiology of this disease are not well understood, and there are many factors that may contribute. Irritable Bowel Syndrome (no significant improvement in IBS IBS Irritable bowel syndrome (IBS) is a functional bowel disease characterized by chronic abdominal pain and altered bowel habits without an identifiable organic cause. The etiology and pathophysiology of this disease are not well understood, and there are many factors that may contribute. Irritable Bowel Syndrome symptoms).^[7,8]
Behavioral therapy:^[10,11,15]
- Examples: cognitive behavioral therapy Cognitive behavioral therapy A directive form of psychotherapy based on the interpretation of situations (cognitive structure of experiences) that determine how an individual feels and behaves. It is based on the premise that cognition, the process of acquiring knowledge and forming beliefs, is a primary determinant of mood and behavior. The therapy uses behavioral and verbal techniques to identify and correct negative thinking that is at the root of the aberrant behavior. Psychotherapy, hypnotherapy
- Offer especially if symptoms do not improve after 12 months of treatment

Differential Diagnosis

Celiac disease Celiac disease Celiac disease (also known as celiac sprue or gluten enteropathy) is an autoimmune reaction to gliadin, which is a component of gluten. Celiac disease is closely associated with HLA-DQ2 and HLA-DQ8. The immune response is localized to the proximal small intestine and causes the characteristic histologic findings of villous atrophy, crypt hyperplasia, and intraepithelial lymphocytosis. Celiac Disease: an immunologically mediated disease resulting in mucosal inflammation Inflammation Inflammation is a complex set of responses to infection and injury involving leukocytes as the principal cellular mediators in the body’s defense against pathogenic organisms. Inflammation is also seen as a response to tissue injury in the process of wound healing. The 5 cardinal signs of inflammation are pain, heat, redness, swelling, and loss of function. Inflammation and villous atrophy Villous Atrophy Giardia/Giardiasis in the small bowel Small bowel The small intestine is the longest part of the GI tract, extending from the pyloric orifice of the stomach to the ileocecal junction. The small intestine is the major organ responsible for chemical digestion and absorption of nutrients. It is divided into 3 segments: the duodenum, the jejunum, and the ileum. Small Intestine: Anatomy due to gluten Gluten Prolamins in the endosperm of seeds from the triticeae tribe which includes species of wheat; barley; and rye. Celiac Disease. Symptoms include abdominal bloating Bloating Constipation and foul-smelling diarrhea Diarrhea Diarrhea is defined as ≥ 3 watery or loose stools in a 24-hour period. There are a multitude of etiologies, which can be classified based on the underlying mechanism of disease. The duration of symptoms (acute or chronic) and characteristics of the stools (e.g., watery, bloody, steatorrheic, mucoid) can help guide further diagnostic evaluation. Diarrhea. Patients Patients Individuals participating in the health care system for the purpose of receiving therapeutic, diagnostic, or preventive procedures. Clinician–Patient Relationship may also have nutritional deficiencies and weight loss Weight loss Decrease in existing body weight. Bariatric Surgery due to malabsorption Malabsorption General term for a group of malnutrition syndromes caused by failure of normal intestinal absorption of nutrients. Malabsorption and Maldigestion, which is not found in IBS IBS Irritable bowel syndrome (IBS) is a functional bowel disease characterized by chronic abdominal pain and altered bowel habits without an identifiable organic cause. The etiology and pathophysiology of this disease are not well understood, and there are many factors that may contribute. Irritable Bowel Syndrome. The diagnosis is established with serologic markers and small bowel Small bowel The small intestine is the longest part of the GI tract, extending from the pyloric orifice of the stomach to the ileocecal junction. The small intestine is the major organ responsible for chemical digestion and absorption of nutrients. It is divided into 3 segments: the duodenum, the jejunum, and the ileum. Small Intestine: Anatomy biopsy Biopsy Removal and pathologic examination of specimens from the living body. Ewing Sarcoma. Treatment requires a strict, gluten-free diet.
Inflammatory bowel disease: includes Crohn’s disease and ulcerative colitis Colitis Inflammation of the colon section of the large intestine, usually with symptoms such as diarrhea (often with blood and mucus), abdominal pain, and fever. Pseudomembranous Colitis. The disease is characterized by chronic inflammation Chronic Inflammation Inflammation of the GI tract due to a cell-mediated immune response to the GI mucosa. Symptoms include diarrhea Diarrhea Diarrhea is defined as ≥ 3 watery or loose stools in a 24-hour period. There are a multitude of etiologies, which can be classified based on the underlying mechanism of disease. The duration of symptoms (acute or chronic) and characteristics of the stools (e.g., watery, bloody, steatorrheic, mucoid) can help guide further diagnostic evaluation. Diarrhea, abdominal pain Abdominal Pain Acute Abdomen, weight loss Weight loss Decrease in existing body weight. Bariatric Surgery, and extraintestinal manifestations, which help differentiate IBD from IBS IBS Irritable bowel syndrome (IBS) is a functional bowel disease characterized by chronic abdominal pain and altered bowel habits without an identifiable organic cause. The etiology and pathophysiology of this disease are not well understood, and there are many factors that may contribute. Irritable Bowel Syndrome. Diagnosis includes imaging, endoscopy Endoscopy Procedures of applying endoscopes for disease diagnosis and treatment. Endoscopy involves passing an optical instrument through a small incision in the skin i.e., percutaneous; or through a natural orifice and along natural body pathways such as the digestive tract; and/or through an incision in the wall of a tubular structure or organ, i.e. Transluminal, to examine or perform surgery on the interior parts of the body. Gastroesophageal Reflux Disease (GERD) and biopsy Biopsy Removal and pathologic examination of specimens from the living body. Ewing Sarcoma. Treatment involves steroids Steroids A group of polycyclic compounds closely related biochemically to terpenes. They include cholesterol, numerous hormones, precursors of certain vitamins, bile acids, alcohols (sterols), and certain natural drugs and poisons. Steroids have a common nucleus, a fused, reduced 17-carbon atom ring system, cyclopentanoperhydrophenanthrene. Most steroids also have two methyl groups and an aliphatic side-chain attached to the nucleus. Benign Liver Tumors, aminosalicylates, immunomodulators, and biologic agents Biologic Agents Immunosuppressants.
Microscopic colitis Colitis Inflammation of the colon section of the large intestine, usually with symptoms such as diarrhea (often with blood and mucus), abdominal pain, and fever. Pseudomembranous Colitis: a chronic inflammatory disease of the colon Colon The large intestines constitute the last portion of the digestive system. The large intestine consists of the cecum, appendix, colon (with ascending, transverse, descending, and sigmoid segments), rectum, and anal canal. The primary function of the colon is to remove water and compact the stool prior to expulsion from the body via the rectum and anal canal. Colon, Cecum, and Appendix: Anatomy, which can be categorized as collagenous or lymphocytic colitis Colitis Inflammation of the colon section of the large intestine, usually with symptoms such as diarrhea (often with blood and mucus), abdominal pain, and fever. Pseudomembranous Colitis. Patients Patients Individuals participating in the health care system for the purpose of receiving therapeutic, diagnostic, or preventive procedures. Clinician–Patient Relationship tend to be middle-aged. Symptoms include chronic, watery diarrhea Watery diarrhea Rotavirus, abdominal pain Abdominal Pain Acute Abdomen, and bloating Bloating Constipation. A colonoscopy Colonoscopy Endoscopic examination, therapy or surgery of the luminal surface of the colon. Colorectal Cancer Screening will appear normal, but inflammatory cells, cryptitis, or a subepithelial Subepithelial Membranoproliferative Glomerulonephritis collagen Collagen A polypeptide substance comprising about one third of the total protein in mammalian organisms. It is the main constituent of skin; connective tissue; and the organic substance of bones (bone and bones) and teeth (tooth). Connective Tissue: Histology band will be seen on biopsy Biopsy Removal and pathologic examination of specimens from the living body. Ewing Sarcoma, differentiating microscopic colitis Colitis Inflammation of the colon section of the large intestine, usually with symptoms such as diarrhea (often with blood and mucus), abdominal pain, and fever. Pseudomembranous Colitis from IBS IBS Irritable bowel syndrome (IBS) is a functional bowel disease characterized by chronic abdominal pain and altered bowel habits without an identifiable organic cause. The etiology and pathophysiology of this disease are not well understood, and there are many factors that may contribute. Irritable Bowel Syndrome. Treatment includes trigger Trigger The type of signal that initiates the inspiratory phase by the ventilator Invasive Mechanical Ventilation avoidance, glucocorticoids Glucocorticoids Glucocorticoids are a class within the corticosteroid family. Glucocorticoids are chemically and functionally similar to endogenous cortisol. There are a wide array of indications, which primarily benefit from the antiinflammatory and immunosuppressive effects of this class of drugs. Glucocorticoids, and symptom management.
Small intestinal bacterial overgrowth Bacterial overgrowth Lactose Intolerance: defined as excessive bacteria Bacteria Bacteria are prokaryotic single-celled microorganisms that are metabolically active and divide by binary fission. Some of these organisms play a significant role in the pathogenesis of diseases. Bacteriology growing in the small intestine Small intestine The small intestine is the longest part of the GI tract, extending from the pyloric orifice of the stomach to the ileocecal junction. The small intestine is the major organ responsible for chemical digestion and absorption of nutrients. It is divided into 3 segments: the duodenum, the jejunum, and the ileum. Small Intestine: Anatomy, and can result due to alteration in the intestinal anatomy or motility Motility The motor activity of the gastrointestinal tract. Gastrointestinal Motility. Symptoms can range from mildly symptomatic to chronic diarrhea Diarrhea Diarrhea is defined as ≥ 3 watery or loose stools in a 24-hour period. There are a multitude of etiologies, which can be classified based on the underlying mechanism of disease. The duration of symptoms (acute or chronic) and characteristics of the stools (e.g., watery, bloody, steatorrheic, mucoid) can help guide further diagnostic evaluation. Diarrhea, weight loss Weight loss Decrease in existing body weight. Bariatric Surgery, and malabsorption Malabsorption General term for a group of malnutrition syndromes caused by failure of normal intestinal absorption of nutrients. Malabsorption and Maldigestion. Bacterial cultures and breath tests can distinguish this condition from IBS IBS Irritable bowel syndrome (IBS) is a functional bowel disease characterized by chronic abdominal pain and altered bowel habits without an identifiable organic cause. The etiology and pathophysiology of this disease are not well understood, and there are many factors that may contribute. Irritable Bowel Syndrome. Treatment includes antibiotics and correction of nutritional deficiencies.
Lactose intolerance Lactose intolerance Lactose intolerance (LI) describes a constellation of symptoms due to lactase deficiency (LD), the enzyme located in the brush border of the absorptive cells in the small intestine. Lactose is the disaccharide present in milk and requires hydrolysis by lactase to break it down into its 2 absorbable constituents, glucose and galactose. Lactose intolerance typically presents with bloating, abdominal cramping, diarrhea, and flatulence. Lactose Intolerance: an intolerance to lactose-containing foods due to lactase deficiency Lactase deficiency Lactose Intolerance. Symptoms include crampy abdominal pain Abdominal Pain Acute Abdomen, bloating Bloating Constipation, nausea Nausea An unpleasant sensation in the stomach usually accompanied by the urge to vomit. Common causes are early pregnancy, sea and motion sickness, emotional stress, intense pain, food poisoning, and various enteroviruses. Antiemetics, and diarrhea Diarrhea Diarrhea is defined as ≥ 3 watery or loose stools in a 24-hour period. There are a multitude of etiologies, which can be classified based on the underlying mechanism of disease. The duration of symptoms (acute or chronic) and characteristics of the stools (e.g., watery, bloody, steatorrheic, mucoid) can help guide further diagnostic evaluation. Diarrhea. Diagnosis is based on the association with lactose-containing foods and a lactose hydrogen breath test Hydrogen breath test Lactose Intolerance, which will differentiate the condition from IBS IBS Irritable bowel syndrome (IBS) is a functional bowel disease characterized by chronic abdominal pain and altered bowel habits without an identifiable organic cause. The etiology and pathophysiology of this disease are not well understood, and there are many factors that may contribute. Irritable Bowel Syndrome. Management includes restriction of dietary lactose and enzyme replacement Enzyme replacement Therapeutic replacement or supplementation of defective or missing enzymes to alleviate the effects of enzyme deficiency (e.g., glucosylceramidase replacement for gaucher disease). Severe Combined Immunodeficiency (SCID).
Giardiasis Giardiasis An infection of the small intestine caused by the flagellated protozoan giardia. It is spread via contaminated food and water and by direct person-to-person contact. Giardia/Giardiasis: an intestinal infection due to Giardia Giardia A genus of flagellate intestinal eukaryotes parasitic in various vertebrates, including humans. Characteristics include the presence of four pairs of flagella arising from a complicated system of axonemes and cysts that are ellipsoidal to ovoidal in shape. Nitroimidazoles duodenalis. Patients Patients Individuals participating in the health care system for the purpose of receiving therapeutic, diagnostic, or preventive procedures. Clinician–Patient Relationship may be asymptomatic or have watery, foul-smelling diarrhea Diarrhea Diarrhea is defined as ≥ 3 watery or loose stools in a 24-hour period. There are a multitude of etiologies, which can be classified based on the underlying mechanism of disease. The duration of symptoms (acute or chronic) and characteristics of the stools (e.g., watery, bloody, steatorrheic, mucoid) can help guide further diagnostic evaluation. Diarrhea; abdominal cramping Abdominal cramping Norovirus; and distension. Weight loss Weight loss Decrease in existing body weight. Bariatric Surgery and evidence of malabsorption Malabsorption General term for a group of malnutrition syndromes caused by failure of normal intestinal absorption of nutrients. Malabsorption and Maldigestion may be present and will differentiate this condition from IBS IBS Irritable bowel syndrome (IBS) is a functional bowel disease characterized by chronic abdominal pain and altered bowel habits without an identifiable organic cause. The etiology and pathophysiology of this disease are not well understood, and there are many factors that may contribute. Irritable Bowel Syndrome. Stool studies for Giardia Giardia A genus of flagellate intestinal eukaryotes parasitic in various vertebrates, including humans. Characteristics include the presence of four pairs of flagella arising from a complicated system of axonemes and cysts that are ellipsoidal to ovoidal in shape. Nitroimidazoles will establish the diagnosis, and treatment includes metronidazole Metronidazole A nitroimidazole used to treat amebiasis; vaginitis; trichomonas infections; giardiasis; anaerobic bacteria; and treponemal infections. Pyogenic Liver Abscess, tinidazole Tinidazole A nitroimidazole alkylating agent that is used as an antitrichomonal agent against trichomonas vaginalis; entamoeba histolytica; and giardia lamblia infections. It also acts as an antibacterial agent for the treatment of bacterial vaginosis and anaerobic bacterial infections. Nitroimidazoles, or nitazoxanide.

Billing and Coding

Diagnosis Codes:

Irritable Bowel Syndrome Irritable bowel syndrome Irritable bowel syndrome (IBS) is a functional bowel disease characterized by chronic abdominal pain and altered bowel habits without an identifiable organic cause. The etiology and pathophysiology of this disease are not well understood, and there are many factors that may contribute. Irritable Bowel Syndrome ( IBS IBS Irritable bowel syndrome (IBS) is a functional bowel disease characterized by chronic abdominal pain and altered bowel habits without an identifiable organic cause. The etiology and pathophysiology of this disease are not well understood, and there are many factors that may contribute. Irritable Bowel Syndrome) is coded based on the predominant symptom, such as IBS IBS Irritable bowel syndrome (IBS) is a functional bowel disease characterized by chronic abdominal pain and altered bowel habits without an identifiable organic cause. The etiology and pathophysiology of this disease are not well understood, and there are many factors that may contribute. Irritable Bowel Syndrome with diarrhea Diarrhea Diarrhea is defined as ≥ 3 watery or loose stools in a 24-hour period. There are a multitude of etiologies, which can be classified based on the underlying mechanism of disease. The duration of symptoms (acute or chronic) and characteristics of the stools (e.g., watery, bloody, steatorrheic, mucoid) can help guide further diagnostic evaluation. Diarrhea (IBS-D), IBS IBS Irritable bowel syndrome (IBS) is a functional bowel disease characterized by chronic abdominal pain and altered bowel habits without an identifiable organic cause. The etiology and pathophysiology of this disease are not well understood, and there are many factors that may contribute. Irritable Bowel Syndrome with constipation Constipation Constipation is common and may be due to a variety of causes. Constipation is generally defined as bowel movement frequency < 3 times per week. Patients who are constipated often strain to pass hard stools. The condition is classified as primary (also known as idiopathic or functional constipation) or secondary, and as acute or chronic. Constipation (IBS-C), or mixed-type (IBS-M).

Coding System	Code	Description
ICD-10-CM	K58.0	Irritable bowel syndrome Irritable bowel syndrome Irritable bowel syndrome (IBS) is a functional bowel disease characterized by chronic abdominal pain and altered bowel habits without an identifiable organic cause. The etiology and pathophysiology of this disease are not well understood, and there are many factors that may contribute. Irritable Bowel Syndrome with diarrhea Diarrhea Diarrhea is defined as ≥ 3 watery or loose stools in a 24-hour period. There are a multitude of etiologies, which can be classified based on the underlying mechanism of disease. The duration of symptoms (acute or chronic) and characteristics of the stools (e.g., watery, bloody, steatorrheic, mucoid) can help guide further diagnostic evaluation. Diarrhea
ICD-10-CM	K58.1	Irritable bowel syndrome Irritable bowel syndrome Irritable bowel syndrome (IBS) is a functional bowel disease characterized by chronic abdominal pain and altered bowel habits without an identifiable organic cause. The etiology and pathophysiology of this disease are not well understood, and there are many factors that may contribute. Irritable Bowel Syndrome with constipation Constipation Constipation is common and may be due to a variety of causes. Constipation is generally defined as bowel movement frequency < 3 times per week. Patients who are constipated often strain to pass hard stools. The condition is classified as primary (also known as idiopathic or functional constipation) or secondary, and as acute or chronic. Constipation
ICD-10-CM	K58.2	Mixed irritable bowel syndrome Irritable bowel syndrome Irritable bowel syndrome (IBS) is a functional bowel disease characterized by chronic abdominal pain and altered bowel habits without an identifiable organic cause. The etiology and pathophysiology of this disease are not well understood, and there are many factors that may contribute. Irritable Bowel Syndrome

Medications:

These codes are for medications used to manage IBS IBS Irritable bowel syndrome (IBS) is a functional bowel disease characterized by chronic abdominal pain and altered bowel habits without an identifiable organic cause. The etiology and pathophysiology of this disease are not well understood, and there are many factors that may contribute. Irritable Bowel Syndrome symptoms. Dicyclomine Dicyclomine A muscarinic antagonist used as an antispasmodic and in urinary incontinence. It has little effect on glandular secretion or the cardiovascular system. It does have some local anesthetic properties and is used in gastrointestinal, biliary, and urinary tract spasms. Anticholinergic Drugs is an antispasmodic Antispasmodic Antispasmodics are a group of medications used to reduce excessive GI smooth muscle contractility and spasm. These medications may be helpful in those with abdominal pain due to conditions such as irritable bowel syndrome, although their efficacy is controversial. Antispasmodics for abdominal cramping Abdominal cramping Norovirus, loperamide Loperamide One of the long-acting synthetic antidiarrheals; it is not significantly absorbed from the gut, and has no effect on the adrenergic system or central nervous system, but may antagonize histamine and interfere with acetylcholine release locally. Antidiarrheal Drugs treats diarrhea Diarrhea Diarrhea is defined as ≥ 3 watery or loose stools in a 24-hour period. There are a multitude of etiologies, which can be classified based on the underlying mechanism of disease. The duration of symptoms (acute or chronic) and characteristics of the stools (e.g., watery, bloody, steatorrheic, mucoid) can help guide further diagnostic evaluation. Diarrhea, and lubiprostone is used for constipation Constipation Constipation is common and may be due to a variety of causes. Constipation is generally defined as bowel movement frequency < 3 times per week. Patients who are constipated often strain to pass hard stools. The condition is classified as primary (also known as idiopathic or functional constipation) or secondary, and as acute or chronic. Constipation.

Coding System	Code	Description
RxNorm	3423	Dicyclomine Dicyclomine A muscarinic antagonist used as an antispasmodic and in urinary incontinence. It has little effect on glandular secretion or the cardiovascular system. It does have some local anesthetic properties and is used in gastrointestinal, biliary, and urinary tract spasms. Anticholinergic Drugs (ingredient)
RxNorm	6448	Loperamide Loperamide One of the long-acting synthetic antidiarrheals; it is not significantly absorbed from the gut, and has no effect on the adrenergic system or central nervous system, but may antagonize histamine and interfere with acetylcholine release locally. Antidiarrheal Drugs (ingredient)
RxNorm	403816	Lubiprostone (ingredient)

References

Moleski, S.M. (2020). Irritable bowel syndrome (IBS). [online] MSD Manual Professional Version. Retrieved November 16, 2020, from https://www.msdmanuals.com/professional/gastrointestinal-disorders/irritable-bowel-syndrome-ibs/irritable-bowel-syndrome-ibs
Lehrer, J.K., and Lichtenstein, G.R. (2019). Irritable bowel syndrome (IBS). In Anand, B.S. (Ed.), Medscape. Retrieved November 16, 2020, from https://emedicine.medscape.com/article/180389-overview
Walk, A. (2019). Clinical manifestations and diagnosis of irritable bowel syndrome in adults. In Grover, S. (Ed.), Uptodate. Retrieved November 16, 2020, from https://www.uptodate.com/contents/clinical-manifestations-and-diagnosis-of-irritable-bowel-syndrome-in-adults
Wald, A. (2020). Pathophysiology of irritable bowel syndrome. In Grover, S. (Ed.), Uptodate. Retrieved November 16, 2020, from
Walkd, A. (2020). Treatment of irritable bowel syndrome in adults. In Grover, S. (Ed.), Uptodate. Retrieved November 16, 2020, from https://www.uptodate.com/contents/treatment-of-irritable-bowel-syndrome-in-adults
Chang, L., Sultan, S., Lembo, A., Verne, G. N., Smalley, W., Heidelbaugh, J. J. (2022). AGA clinical practice guideline on the pharmacological management of irritable bowel syndrome with constipation. Gastroenterology, 163(1), 118–136. https://doi.org/10.1053/j.gastro.2022.04.016
Lembo, A., Sultan, S., Chang, L., Heidelbaugh, J. J., Smalley, W., Verne, G. N. (2022). AGA clinical practice guideline on the pharmacological management of irritable bowel syndrome with diarrhea. Gastroenterology, 163(1), 137–151. https://doi.org/10.1053/j.gastro.2022.04.017
Ford, A. C., Lacy, B. E., Talley, N. J. (2017). Irritable bowel syndrome. New England Journal of Medicine, 376(26), 2566–2578. doi: 10.1056/NEJMra1607547. PMID: 28657875.
Lacy, B. E., Patel, N. K. (2017). Rome criteria and a diagnostic approach to irritable bowel syndrome. Journal of Clinical Medicine, 6(11), 99. https://doi.org/10.3390/jcm6110099
National Institute for Health and Care Excellence. (2017). Irritable bowel syndrome in adults: diagnosis and management. Retrieved September 5, 2022, from https://www.nice.org.uk/guidance/cg61
Vasant, D. H., Paine, P. A., Black, C. J., Houghton, L. A., Everitt, H. A., Corsetti, M., Agrawal, A., Aziz, I., Farmer, A. D., Eugenicos, M. P., Moss-Morris, R., Yiannakou, Y., Ford, A. C. (2021). British Society of Gastroenterology guidelines on the management of irritable bowel syndrome. Gut, 70(7), 1214–1240. https://doi.org/10.1136/gutjnl-2021-324598
World Gastroenterology Organisation. (2015). Irritable bowel syndrome: a global perspective. Retrieved September 5, 2022, from https://www.worldgastroenterology.org/guidelines/irritable-bowel-syndrome-ibs/irritable-bowel-syndrome-ibs-english
Wedlake, L., A’Hern, R., Russell, D., Thomas, K., Walters, J. R., Andreyev, H. J. (2009). Systematic review: the prevalence of idiopathic bile acid malabsorption as diagnosed by SeHCAT scanning in patients with diarrhoea-predominant irritable bowel syndrome. Alimentary Pharmacology & Therapeutics, 30(7), 707–717. https://doi.org/10.1111/j.1365-2036.2009.04081.x
Garsed, K., Chernova, J., Hastings, M., Lam, C., Marciani, L., Singh, G., Henry, A., Hall, I., Whorwell, P., Spiller, R. (2014). A randomised trial of ondansetron for the treatment of irritable bowel syndrome with diarrhoea. Gut, 63(10), 1617–1625. https://doi.org/10.1136/gutjnl-2013-305989
Lacy, B. E., Pimentel, M., Brenner, D. M., Chey, W. D., Keefer, L. A., Long, M. D., Moshiree, B. (2021). ACG clinical guideline: management of irritable bowel syndrome. American Journal of Gastroenterology, 116(1), 17–44. https://doi.org/10.14309/ajg.0000000000001036

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Epidemiology and Pathophysiology

Epidemiology^[2,3,7]

Pathophysiology^[1,4,8]

Related videos

Clinical Presentation

Classification^[7–9]

Other signs and symptoms^[2,3,9]

Diagnosis

Criteria for diagnosis^[8,9,11,12]

Abnormal bowel movements^[9]

Tests to rule out organic disease

Related videos

Management

General measures^[10–12]

Dietary modifications^{[8,10–12,15]}

Pharmacologic agents, based on symptoms

Related videos

Differential Diagnosis

Billing and Coding

References

Lecturio

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Achieve Mastery of Medical Concepts

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Irritable Bowel Syndrome (Clinical)

Epidemiology and Pathophysiology

Epidemiology[2,3,7]

Pathophysiology[1,4,8]

Related videos

Clinical Presentation

Classification[7–9]

Other signs and symptoms[2,3,9]

Diagnosis

Criteria for diagnosis[8,9,11,12]

Abnormal bowel movements[9]

Tests to rule out organic disease

Related videos

Management

General measures[10–12]

Dietary modifications[8,10–12,15]

Pharmacologic agents, based on symptoms

Related videos

Differential Diagnosis

Billing and Coding

References

Lecturio

Support

Institutions

Resources

Follow Us

Create your free account or log in to continue reading!

User Reviews

Details

Get Premium to test your knowledge

Get Premium to watch all videos

Create a free account to test your knowledge

Epidemiology^[2,3,7]

Pathophysiology^[1,4,8]

Classification^[7–9]

Other signs and symptoms^[2,3,9]

Criteria for diagnosis^[8,9,11,12]

Abnormal bowel movements^[9]

General measures^[10–12]

Dietary modifications^{[8,10–12,15]}