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Positive fecal occult blood test

Image : “Positive fecal occult blood test” by
James Heilman, MD. License: CC BY-SA 3.0

Definition and Background of Gastrointestinal Bleeding

Gastrointestinal bleeding is one of the common causes of hospital admissions and it is a life-threatening abdominal emergency. If the bleeding source is proximal to the ligament of Treitz, it is considered upper gastrointestinal bleeding.

Epidemiology of Gastrointestinal Bleeding

About 100,000 patients are hospitalized every year in the United States because of upper GI bleeding. About 70,000 UGIB patients are admitted to hospitals each year in the United Kingdom. Males have a 2-fold higher risk of developing upper GI bleeding than females; older patients (more than 60 years old) have a higher risk of mortality.

Etiology of Gastrointestinal Bleeding

Non-steroidal anti-inflammatory drugs (NSAIDs)

NSAIDs inhibit cyclooxygenase, which results in decreased synthesis of mucosal prostaglandin and leads to impaired mucosal defenses. There is a 40-fold increase in the risk of developing a gastric ulcer (leading to gastrointestinal bleeding) in patients who use NSAIDs on a daily basis, and the risk of duodenal ulcer formation increases to 8-fold in these patients.


The majority of patients presenting with upper gastrointestinal bleeding suffer from peptic ulcers. As the ulcer gets deeper into the mucosa, it causes weakening and necrosis of the arterial wall, eventually resulting in bleeding.


The upper stomach and the lower esophagus are inverted forcefully during vomiting, which may lead to a mucosal tear in one of these parts. The severity of the bleeding is determined by the depth of the tear in the mucosa. Sometimes, in rare cases, an esophageal rupture may occur, leading to a condition called Boerhaave syndrome.

Endoscopic image of Mallory-Weiss tear

Image: “Endoscopic Image of Mallory-Weiss Tear” by Samir. License: CC BY-SA 3.0

Mallory-Weiss tears

Mallory-Weiss tears are tears in the mucosa of the gastric cardia, which results in massive upper gastrointestinal bleeding. About 15% of acute upper GI bleeding is caused by Mallory-Weiss tears.

Acute stress gastritis

Different predisposing clinical conditions, such as multiple trauma, shock, acute renal failureand respiratory distress syndrome, may have the potential to alter the protective barriers of the mucosa.

Symptoms of Gastrointestinal Bleeding

Signs of gastrointestinal bleeding

  • Reddish stool in toilet bowl water due to dragon fruit consumption

    Image: “Reddish stool in toilet bowl water due to dragon fruit consumption” by Hanif Ibrahim90. License: CC BY-SA 3.0

    Melena (black stool with bad odor)


  • Hematochezia (red stools)
  • Presyncope
  • Syncope
  • Dyspepsia
  • Heartburn
  • Epigastric pain
  • Dysphagia
  • Diffuse abdominal pain
  • Weight loss
  • Jaundice

It is important to do a thorough physical examination in order to evaluate for shock or blood loss. Blood pressure and pulse should be checked for patients presenting with upper GI bleeding. A physical examination should also include looking for signs of liver disease, such as gynecomastia, splenomegaly, ascites and spider angioma; or signs of a tumor, such as abdominal mass, nodular liver, and enlarged lymph nodes.

Presentation of Gastrointestinal Bleeding

A thorough history and physical examination are important in patients presenting with symptoms and signs of GI bleeding. It is important to ask about comorbid diseases, medications use, exposure to toxins, as well as the course of the symptoms.

Diagnosis of Gastrointestinal Bleeding

It is important to assess the level of blood loss in patients with gastrointestinal bleeding through a complete blood count with platelet count and differential. Patients should be assessed for a hemorrhagic shock as it has a high mortality risk up to 30%. Hemorrhagic shock can be classified into four classes based on the detected signs:

Class 1 Class 2 Class 3 Class 4
Blood loss, mL Up to 750 750–1500 1500–2000 > 2000
Blood loss, % blood volume Up to 15% 15–30 % 30–40 % > 40 %
Pulse rate, bpm < 100 > 100 > 120 > 140
Respiratory rate  

Normal or increased


Decreased Decreased Decreased
Blood pressure Normal Normal Decreased Decreased
Urine output, mL/h > 35 30–40 20–30 14–20
CNS status  

Slightly anxious


Mildly anxious Anxious and confused Confused and lethargic
Fluid replacement  



Crystalloid and blood Crystalloid and blood
gastrointestinal bleeding

Image: “ Esophagogastroduodenoscopy (EGD) when the patient presented with gastrointestinal bleeding. (A) Esophagogastroduodenoscopy revealed diffuse mucosal bleeding of the antrum that resembled gastric antral vascular ectasia. (B) Magnifying endoscopy (ME) findings. The gastric mucosa was friable, and oozing bleeding occurred from ectatic vessel rupture. (C) ME with narrow-band imaging revealed congestive and dilated subepithelial capillaries in the background mucosa.” by openi. License: CC BY 2.0


Blood type and crossmatch should be ordered, depending on the clinical assessment and the initial hemoglobin level of the patient. Because of hypovolemia and hypoperfusion, patients with GI bleeding usually require blood transfusions.


It is essential to evaluate for renal comorbidity using the basic metabolic profile (BMP). However, BUN levels may be elevated as a result of the blood in the upper intestine.

Coagulation profile

Coagulopathy should be documented by measuring the patient’s prothrombin time, activated partial thromboplastin time and international normalized ratio Chest radiographs
Ordering chest x-rays is useful in excluding several conditions, including effusion, aspiration pneumonia, as well as esophageal perforation. Perforated ileus and viscus can be excluded using upright radiographs.


Using endoscopy is very useful in both the diagnosis and management of GI bleeding. It can be used to detect the source of bleeding and manage it.

Computed tomography scanning (CT)

Different conditions can be evaluated using CT scanning and ultrasonography, such as liver cirrhosis, cholecystitis, pancreatitis with hemorrhage and pseudocyst, aortoenteric fistula, or other uncommon causes of gastrointestinal bleeding.


If endoscopy fails to identify the source of bleeding, then angiography can be useful in case the bleeding persists.

Nasogastric lavage

It is an important procedure used to confirm possible active bleeding or recent bleeding. The nasogastric tube can also reduce the chance of vomiting in patients.

Differential Diagnosis of Gastrointestinal Bleeding

Clinical pictures similar to gastrointestinal bleeding

Therapy of Gastrointestinal Bleeding

Treatment of gastrointestinal bleeding

Correction of the shock and coagulation abnormalities in order to stabilize the patient is the main goal in management.

Proton pump inhibitors (PPIs)

Treatment with high doses of proton pump inhibitors helps decrease the risk of needing endoscopy as a treatment procedure. PPIs maintain the level of gastric pH above 6, which protects an ulcer clot from fibrinolysis.

Therapeutic endoscopy

It is considered the method of choice in controlling hemorrhages from active ulcers. Seven techniques can be used in therapeutic endoscopy, which are:

  1. Heater-probe coagulation
  2. Bipolar electrode coagulation
  3. Injection of sclerosants or epinephrine
  4. Laser coagulation
  5. Use of banding devices
  6. Argon plasma coagulation
  7. Endoscopic application of clips


Surgical intervention may be required in some patients. Indications for surgical intervention include:

  • Persistent recurrent bleeding after the failure of medical therapy and endoscopic hemostasis
  • A hemorrhage that is severe and life-threatening and not responding to resuscitation.
  • Other coexisting reasons for surgical intervention, such as obstruction, malignancy or perforation.
  • If the patient is hospitalized for the second time because of peptic ulcer hemorrhage.
  • Bleeding for a long time, with more than 50% loss of the patient’s blood volume
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