Psychiatry/Behavioral · PANCE / PANRE

Factitious Disorder vs Malingering

Both involve intentional symptom production; factitious is motivated by the sick role, malingering by external incentive (only factitious is a mental disorder).

Also known as: factitious disorder, Munchausen, malingering, factitious imposed on another

Overview

Factitious Disorder (DSM-5-TR): falsification of physical or psychological signs/symptoms, or induction of injury or disease, associated with identified deception; the individual presents themselves (or another — Factitious Disorder Imposed on Another, formerly Munchausen by proxy) as ill, impaired, or injured; the deceptive behavior is evident even in the absence of obvious external rewards; not better explained by another mental disorder. Malingering: intentional production or gross exaggeration of physical/psychological symptoms motivated by external incentives (disability, drugs, avoiding work, military duty, criminal prosecution). Malingering is a V/Z-code, NOT a mental disorder.

Epidemiology

Factitious disorder estimated at ~1% of inpatient consultations; likely underrecognized. Factitious imposed on another disproportionately involves female caregivers and pediatric victims. Malingering more common in forensic, disability, and substance-seeking contexts; base rate varies widely (5-30% depending on setting).

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Pathophysiology

Factitious disorder: motivation is intrapsychic — to assume the sick role — and behavior is consciously produced but reflects pathologic need for care/attention. Mechanism is poorly understood but linked to early attachment disturbance and dysfunctional coping. Malingering is not a psychiatric disorder; it is a conscious choice for tangible gain.

Differential diagnosis

Somatic symptom disorder — Symptoms NOT intentionally produced; distress is the core feature
Conversion disorder — Symptoms NOT intentionally produced; incompatibility with neurologic disease
Illness anxiety disorder — Preoccupation with illness; no fabrication of signs
True medical illness — Always reconsider before labeling — fabrication and real disease can coexist
Delusional disorder, somatic type — Fixed false belief without conscious deception

Diagnostic workup

Diagnostic criteria

Factitious: deception with falsification or induction; presents self/other as ill; behavior evident even without external reward; not better explained by another disorder. Malingering: intentional symptom production for external incentive — coded as V65.2 / Z76.5 (not a mental disorder).

Labs

Targeted testing based on presentation
Toxicology / drug levels when surreptitious medication suspected
Urine sulfonylurea or insulin/C-peptide levels in unexplained hypoglycemia
Coagulation studies and warfarin/heparin assays in unexplained bleeding

Diagnostic algorithm

Feature	Somatic Symptom / Conversion	Factitious Disorder	Malingering
Symptom production	Not intentional	Intentional (conscious)	Intentional (conscious)
Motivation	Distress, illness anxiety	Sick role (intrapsychic)	External incentive (tangible gain)
Mental disorder?	Yes	Yes	No (V/Z code)
Response to confrontation	Defensive but persists	Often denies, moves on	May abandon symptoms when incentive removed
Treatment	CBT, SSRI, primary care continuity	Long-term psychotherapy, non-confrontational	Not a treatment target; address incentive

Differentiating non-intentional somatic disorders, factitious disorder, and malingering — symptom production and motivation are the key axes.

Complications

Iatrogenic harm from unnecessary procedures, medications, surgeries
Death in FDIA victims — case fatality reported up to 6-9%
Healthcare team distress, legal exposure
Loss of trust between patient and clinicians
Missed real disease when label applied prematurely

PANCE pearls

External incentive is the watershed: present = malingering; absent = factitious.
Malingering is NOT a psychiatric diagnosis (V/Z code); factitious disorder IS.
Munchausen syndrome (historical term) ≈ chronic, severe factitious disorder with pseudologia fantastica and peregrination.
Factitious Disorder Imposed on Another (FDIA) is a form of child abuse — mandatory reporting is required.
Do not confront aggressively — collaborative, multidisciplinary planning produces better outcomes.
Always reconsider organic disease — fabrication does not exclude coexisting real pathology.

References

DSM-5-TR — American Psychiatric Association. DSM-5-TR. 2022.
AAP 2007 — Stirling J Jr; AAP Committee on Child Abuse and Neglect. Beyond Munchausen syndrome by proxy: identification and treatment of child abuse in a medical setting. Pediatrics 2007;119:1026-30.
Bass 2014 — Bass C, Halligan P. Factitious disorders and malingering: challenges for clinical assessment and management. Lancet 2014;383(9926):1422-32.

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