Factitious Disorders

Factitious disorder, formerly called Munchausen syndrome, is the intentional falsification of symptoms in order to assume the role of a sick person. Patients may intentionally produce symptoms in someone else (usually a child or elderly patient), which is known as factitious disorder imposed on another (formerly, Munchausen by proxy). Unlike malingering, the falsification of symptoms is not associated with an external reward. Diagnosis is clinical, and treatment centers around nonjudgmental confrontation.

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Epidemiology and Etiology


  • The estimated prevalence is 5% in hospitalized patients. 
  • More common in men than women
  • Prevalence is higher in healthcare workers and those with higher intelligence.
  • Many people with factitious disorders have underlying comorbid psychiatric disorders such as personality, mood, or substance use disorders.


  • Unknown 
  • May be associated with a history of abuse or neglect
  • Hospitalization and medical attention are thought to provide the safe environment that patients have lacked.

Clinical Presentation and Diagnosis

Clinical presentation

  • Symptoms are widely variable and depend on the mechanism of falsification.  
  • Usually presents with dramatic and bizarre clinical presentation that cannot be explained by conventional medical understanding
  • No response to usually effective medical or psychological interventions 
  • Common scenarios:
    • Recurrent episodes of hypoglycemia from auto-injection of insulin 
    • Recurrent infections of wounds
  • If missed, factitious disorders may lead to unintentional death.


The psychiatric interview must include collateral or external sources of information whenever possible. 

  • DSM-V diagnostic criteria for factitious disorder imposed on self
    • Fabrication of physical or psychological signs or symptoms, or distortion of injury or disease, associated with identified deception
    • Presents to others as ill, impaired, or injured 
    • Deceptive behavior is evident in the absence of obvious secondary gains. 
    • The behavior does not coexist with another mental disorder.
  • DSM-V diagnostic criteria for factitious disorder imposed on another individual
    • Also known as Munchausen syndrome by proxy 
    • The person fabricates symptoms in another person and then presents that person to others as ill, impaired, or injured. 
    • Deceptive behavior is evident in the absence of obvious secondary gains. 
    • Remember: This diagnosis is made for the person who is fabricating the symptoms, not the person being presented as ill.
Table: Features of factitious disorder compared with important differential diagnoses
Willingness to undergo evaluationIntentional deceptive behaviorEvidence of external reward
Illness anxiety disorder+
Somatic symptom disorder+
Factitious disorder++


  • Management of factitious disorders should be focused on 3 principles: 
    • Reduce risk of morbidity and mortality.
    • Address underlying psychiatric illness.
    • Beware of legal/ethical implications. 
  • Confront the patient in a nonthreatening manner:
    • Videographic evidence of devious behavior may assist in facilitating conversation, as patients may deny their behavior. 
    • Patients should be referred for psychotherapy.
    • Caution must be exercised during confrontation, as therapeutic rapport may be lost and the patient may seek another provider. 
  • Avoid unnecessary procedures.
  • Factitious disorder imposed on another person warrants a referral to child protective services or appropriate judicial department!
  • Prognosis is poor and treatment should be focused on managing rather than curing the disorder.

Differential Diagnosis

  • Conversion disorder: the presence of symptoms or deficits that affect voluntary motor or sensory function in a way that suggests a neurological condition but is not explained by medical findings. Diagnosis is clinical, and management includes psychological and physical therapy. Unlike factitious disorder, there is no evidence of actual disease or deliberate falsification of symptoms.  
  • Borderline personality disorder: the most commonly recognized personality disorder. Characterized by emotional instability, impulsiveness, distorted patterns of thinking, and intense yet unstable relationships. Diagnosis is clinical and management includes psychotherapy, notably dialectical behavior therapy (DBT). A patient with borderline personality disorder may deliberately induce injury as part of attention-seeking behavior. They will not attempt to deceive the provider. 
  • Malingering: a disorder in which patients present with symptoms for secondary gain (e.g., avoiding the police, time off work, disability benefits). Determination of the external incentive distinguishes malingering from factitious disorder. 


  1. Sadock, BJ, Sadock, VA, Ruiz, P. (2014). Kaplan and Sadock’s synopsis of psychiatry: Behavioral sciences/clinical psychiatry (11th ed.). Chapter 13, Psychosomatic medicine, pages 465–503. Philadelphia, PA: Lippincott Williams and Wilkins.
  2. Jafferany, M, Khalid, Z, McDonald, KA, Shelley, AJ. (2018). Psychological aspects of factitious disorder. The primary care companion for CNS disorders, 20(1), 17nr02229. https://doi.org/10.4088/PCC.17nr02229

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