Factitious Disorder (Munchausen Syndrome)

What factitious disorder is

People with factitious disorder are not simply "faking it" in the everyday sense. They feel a strong, often hidden need to be seen as ill or injured, and to receive the care, attention and identity that being a patient brings. The behavior is deliberate, but the underlying motive is usually not fully understood even by the person, and they find it very hard to stop.

DSM-5-TR describes two types:

• Factitious disorder imposed on self: the person presents themselves as ill. The most extreme, chronic form, with travel between many hospitals and dramatic stories, has been called Munchausen syndrome, though this is only a small minority of cases.
• Factitious disorder imposed on another: a person, usually a parent or caregiver, falsifies or causes illness in a child, older adult, disabled person or pet. The diagnosis applies to the perpetrator. For the child, it is a form of child abuse, often called medical child abuse or Munchausen syndrome by proxy.

It is uncommon but probably underdiagnosed. Estimates suggest around 1% of hospital patients. It is more common in women and in people who work in or have training in healthcare.

How it differs from similar conditions

Signs of factitious disorder

No single sign proves it. Doctors become suspicious when several of these combine:

• a dramatic but inconsistent medical history that changes with each telling
• symptoms that do not respond to standard treatment, or new problems as soon as one is fixed
• symptoms that appear only when the person is alone or unobserved
• lab results that do not make medical sense, such as blood in urine without a cause, or bacteria not normally found together
• unusual knowledge of medical terms and hospital routines
• eagerness for tests, procedures and operations, with many scars
• seeing many doctors or hospitals, sometimes under different names, and reluctance to let doctors talk to family or past providers
• few visitors and limited contact with family during hospital stays
• anger or leaving the hospital when the deception is questioned

Common methods include self-induced infections, wounds that will not heal, taking insulin or blood thinners secretly, adding blood or sugar to urine samples, heating thermometers, taking laxatives or causing vomiting, and inventing seizures or abdominal pain.

Warning signs when imposed on a child

• the child's symptoms occur only in the caregiver's presence and stop when they are separated
• a caregiver who is very attentive, medically knowledgeable and resists the child being discharged
• repeated hospital visits for unexplained apnea, seizures, vomiting, diarrhea, infections or low blood sugar
• siblings with unexplained illness or death

Causes and risk factors

The cause is not known. Factors often found include:

• childhood abuse, neglect or early loss of a parent
• a serious illness or long hospital stays in childhood
• personality disorders, especially borderline traits
• depression, anxiety and low self-esteem
• a history of trauma or PTSD
• work in healthcare

How it is diagnosed

Diagnosis is difficult because the person hides the behavior. Doctors usually first rule out real disease, often after extensive testing. Clues come from:

• reviewing all past medical records from different hospitals
• tests that reveal the method, such as finding insulin without its natural partner molecule C-peptide in someone with low blood sugar, or finding a drug that was not prescribed
• observation, including in some hospitals, supervised sample collection
• talking with family members, with permission

Doctors must also look carefully for any genuine illness, because people with factitious disorder can have real diseases too.

Treatment

There is no medicine that treats factitious disorder itself. Management focuses on safety and engagement:

• A non-punitive conversation: doctors present the findings calmly and offer help, rather than accusing. Many people deny the behavior, and some leave care.
• Psychotherapy: cognitive behavioral therapy and other talking therapies focus on the needs behind the behavior, coping with stress, and building relationships and identity outside the sick role.
• One coordinating doctor: a single primary care doctor who limits unnecessary tests, procedures and hospital admissions, while still responding to real problems.
• Treating co-existing conditions: depression, anxiety, substance use and personality disorders.
• Family therapy: helps relatives understand and avoid reinforcing the behavior.

When the disorder is imposed on another, the priority is the child's or vulnerable person's safety. This involves child protection services and often separation, with therapy for the caregiver.

Complications and outlook

People with factitious disorder can suffer real and lasting harm: infections, organ damage, scars, side effects of unnecessary drugs, surgery and sometimes death. Children who are victims can be seriously injured or killed, and suffer long-term psychological effects. Outcomes are best when the person accepts mental health treatment and keeps a steady relationship with one care team. Long-term Munchausen syndrome has a poorer outlook.

Frequently asked questions

What is the difference between factitious disorder and malingering?

Both involve deliberately faking or causing symptoms. In malingering the goal is an obvious external reward, such as money, drugs, compensation or avoiding work or legal trouble. In factitious disorder there is no obvious reward. The aim is to be seen as sick and receive care.

Is factitious disorder the same as Munchausen syndrome?

Munchausen syndrome is the older name for the most severe, chronic form of factitious disorder imposed on self, involving dramatic stories and moving between hospitals. Doctors now use "factitious disorder" for the whole range, from mild to severe.

What is factitious disorder imposed on another?

It is when a caregiver fakes or causes illness in someone in their care, usually their child, to gain attention or the role of a devoted caregiver. It was called Munchausen syndrome by proxy. It is considered child abuse and must be reported to child protection services.

Do people with factitious disorder know they are faking?

Yes, the actions are deliberate. However, the reasons behind them are often not fully understood by the person, and the urge is hard to control. That is why it is classed as a mental disorder rather than simple lying.

Can factitious disorder be cured?

There is no quick cure, and many people do not accept a diagnosis. Some improve substantially with long-term psychotherapy, a consistent care team and treatment of depression, trauma or personality difficulties. Engagement and safety are the main goals.