Tips for Diagnosing Factitious Disorder Imposed on Another

A 9-month-old male presents to emergency department (ED) with his mother for seizure. The child was diagnosed with seizure disorder at 2 months of age and has had multiple visits to the emergency department (ED) for seizures. The child was delivered at term vaginally, with normal prenatal period and labor. Immunizations are up to date. The child drinks baby formula and has been advancing his diet using baby food. Review of the chart shows that the child has had several negative CT scans and MRIs, and no structural or congenital central nervous system (CNS) abnormalities. The child was started on Levetiracetam and levels always have been normal despite breakthrough seizures. Metabolic conditions were ruled out but the child did have visits with both hyponatremia and hypernatremia present. These resolved during hospitalization. Today, the child is afebrile and vital signs are normal. Examination is unremarkable. Laboratory analysis reveals a sodium of 160 mg/dl. Urine electrolytes were obtained. Pediatric neurology and pediatric intensive care unit PICU were consulted and recommended obtaining anti-epileptic drug levels and starting D5 containing IV fluid. While waiting for bed placement, the RN observes the mother preparing a bottle for the child and comes to you with a concern about what she witnessed. What do you do?

Factitious Disorder Imposed on Another (FDIA), is a psychological disorder in which a caregiver and especially a parent induces the symptoms of a disease or injury in their child, falsifies the child’s medical history, or tampers with the child’s diagnostic specimens to create a situation that typically requires medical attention.1 This is a recognized form of child abuse. The condition was described by Dr. Robert Meadow in 1977, as Munchausen Syndrome by Proxy. It was named after Baron von Munchausen, who was known for having a knack for embellished, elaborate stories.2 Currently the condition has been renamed as Factitious Disorder Imposed on Another (FDIA). The current DSM-5 criteria for the diagnosis of FDIA is, “falsely presenting or causing physician or mental health symptoms in someone else with the intent of deception; authoritatively and falsely presenting another (adult, child, or pet) to others as physically or mentally impaired; the deceptive behavior occurs even when there’s no obvious gain or benefit; and no other mental health condition can explain these behaviors.”2

Several risk factors have been identified in both the parent and child.3,4 Perpetrator risk factors include: female sex, mother of child, health care worker, history of obstetric complications, history of childhood maltreatment, and psychiatric illness (factitious disorder imposed on self, borderline personality disorder, histrionic personality disorder, and depression). Their motive is often to seek sympathy or attention. Victim risk factors include: young children especially younger that 6 years old, sibling of victims of FDIA, elderly, and the disabled. By far, the majority of victims are children. FDIA is estimated to occur in one percent of the population and carries up to a 12 percent victim mortality rate.5

The diagnosis of FDIA is difficult to make and can often take several months. Investigation involves a collaborative effort between child abuse specialists, child-protective services, psychiatry, and law enforcement. During the investigation, the child is often removed from the care of the offender. The offender may end up incarcerated, however the actual treatment is psychiatric, though no medication, behavioral therapy, psychotherapy, or multidisciplinary approach has proven effective. Only about 10 percent of offenders receive ongoing therapy.5 Most cases result in the separation of the child from the offender.5

Emergency physicians can play an important role in the diagnosis by paying attention to potential red flags when evaluating children who repeatedly present for the same problem. These include:5-7

  • Extensive but inconsistent medical history in the patient (victim), often with symptoms that do not correlate
  • Frequent cycles of reporting improvement and worsening of symptoms
  • Tendency to evade questions and change clinicians when a health professional explores other causes than a medical diagnosis
  • Eagerness to have the victim undergo medical examinations, tests, and procedures
  • Intense emotional reactions when a health professional doesn’t provide or confirm the diagnosis
  • Development of new symptoms when testing does not lead to a diagnosis
  • Long history of medical visits and hospital stays
  • Resolution (often complete) of symptoms while hospitalized, but returns while discharged

Case outcome: The registered nurse said she witnessed the mother adding a white substance to the formula. That bottle was confiscated, and the nurse gave the child a different bottle. Child protective services and law enforcement were consulted. The patient’s mother was only permitted to have supervised visits with the child in the hospital while the investigation was underway. The formula was analyzed and was found to have an excessively high sodium concentration. The child’s sodium level quickly returned to normal and remained that way while in the hospital.


Dr. Rozzi

Dr. Rozzi is an emergency physician, medical director of the Forensic Examiner Team at WellSpan York Hospital in York, Pennsylvania, and secretary of ACEP’s Forensic Section.

Dr. RivielloDr. Riviello is chair and professor of emergency medicine at the University of Texas Health Science Center at San Antonio.

  1. Mayo Clinic. Factitious disorder. 2019.
  2. Sousa FD, Kanomata EY, Feldman RJ, et al. Munchausen syndrome and Munchausen syndrome by proxy: a narrative review. Einstein (Sao Paulo).2017;15(4):516-521.
  3. American Psychiatric Association. Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition. Fifth Edition. Arlington, VA: American Psychiatric Association; 2013. 324-326.
  4. Yates G, Bass C. The perpetrators of medical child abuse (Munchausen Syndrome by Proxy) – A systematic review of 796 cases. Child Abuse Negl.2017;72:45-53.
  5. Abdurrachid N, Gama Marques J. Munchausen syndrome by proxy (MSBP): a review regarding perpetrators of factitious disorder imposed on another (FDIA). CNS Spectr. 2022;27(1):16-26.
  6. Gillette H. Falsifying and illness: what is Munchausen by proxy. Psychiatry Central. 2022 Apr 29.
  7. Hettler J, Munchausen syndrome by proxy. Pediatric Emergency Care. 2002;18(5):p 371-374.