MUNCHAUSEN-BY-PROXY ABUSE IS A PATTERN-DETECTION PROBLEM

What a New Systematic Review of 469 Victims Can Teach Us About Munchausen-by-Proxy Abuse (FDIA/Medical Child Abuse)

A physician sees an unexplained illness. An emergency department sees another unusual episode. A school sees a child who is frequently absent. A specialist hears about symptoms that no one else seems able to explain. A family member sees a child who appears remarkably healthy when the caregiver is not around. Child Protective Services receives allegations involving medical care. A detective discovers statements that do not match the records.

Each professional may be seeing something important. The problem is that each may be seeing only one piece of it.

That is one of the most important lessons from a systematic review published in Frontiers in Public Health in January 2026. Researchers Dan Wang, Mengzhen Zhao, Jiayi Yin, and Yuanyuan La reviewed 314 publications involving 455 perpetrators and 469 victims of what the authors identify as Factitious Disorder Imposed on Another, or FDIA.

Throughout this article, I will use the broader term “Munchausen-by-Proxy Abuse (FDIA/Medical Child Abuse)” because the central concern for child protection and investigative professionals is the abusive behavior, the deception, and the resulting harm to the victim.

The researchers examined the characteristics of perpetrators and victims, how cases were identified, interventions used, and eventual outcomes. Some of their findings deserve considerable attention from investigators, child protection professionals, medical providers, prosecutors, and multidisciplinary teams.

But perhaps the most important lesson is simpler.

Munchausen-by-Proxy Abuse is fundamentally a pattern-detection problem.

THE PATTERN MAY BE MORE IMPORTANT THAN THE PROFILE

Professionals sometimes approach suspected Munchausen-by-Proxy Abuse by asking what kind of person commits this form of abuse. Does the caregiver have a psychiatric diagnosis? Does she have medical knowledge? Does she appear unusually comfortable in hospitals? Does she seem to enjoy attention from medical professionals?

Those questions may eventually become relevant. But they can also distract us from a much more useful question:

What happens to the alleged illness when we change the conditions under which we observe it?

Wang and colleagues found that two of the most common reasons professionals began suspecting FDIA were remarkably practical. In 23.88% of cases, symptoms appeared when the perpetrator was present. In 23.03%, symptoms improved when the perpetrator was absent.

Consider the investigative significance of that finding. A caregiver is present and symptoms appear. The caregiver is absent and symptoms diminish. The caregiver reports one history, while the records establish another. The caregiver describes profound impairment, while independent observers describe substantially different functioning. Reported symptoms and objective medical findings repeatedly fail to align. None of those observations, standing alone, proves Munchausen-by-Proxy Abuse. Together, however, they may begin to establish a pattern.

This is not personality profiling. It is corroboration!

THE CASE MAY BE HIDING IN THE TIMELINE

Another finding should immediately get the attention of investigators. Wang and colleagues reported that 72.49% of victims had been hospitalized at least three times. That matters because the evidence necessary to understand one of these cases may not exist in any single medical record.

Imagine a child who has been treated by several emergency departments, pediatricians, specialists, therapists, and hospitals over several years. One physician sees vomiting. Another sees seizures. A school sees excessive absences. A therapist hears about behavioral problems. An emergency department receives reports of another medical crisis. A pharmacy fills medications prescribed by several providers. A relative sees the child behaving normally during a weekend visit. A second parent reports that the child's symptoms disappear while staying in their home.

Every observation exists somewhere. The problem is that nobody may be seeing all of them.

A proper investigation may therefore require records from hospitals, physicians, specialists, emergency departments, pharmacies, schools, CPS, law enforcement, counseling providers, and other sources. Insurance information may be relevant when legally obtainable. Digital evidence may add another layer through text messages, internet searches, patient portals, photographs, videos, emails, social media activity, and communications with medical providers.

The goal is not simply to collect records. The goal is to reconstruct the child's life. Put the information into chronological order. Identify who reported each symptom and who actually observed it. Determine what testing established. Document what happened next. Identify when the caregiver was present and what happened when the caregiver was absent. Separate reported medical history from independently established medical history. Then compare the sources.

The pattern that emerges may tell a very different story from any individual medical record.

37 VICTIMS DIED!

One finding in the Wang review is particularly difficult to ignore.

Of the 469 victims represented in the review, 37 died. That is 7.89%.

We need to be precise about what that number means. The study does not establish that Munchausen-by-Proxy Abuse has a 7.89% mortality rate in the general population. The systematic review relied heavily on published case reports and case series. Severe, unusual, and fatal cases may be disproportionately represented in published literature. We do not have the population denominator necessary to calculate the actual mortality rate.

But the number becomes particularly interesting when compared with earlier literature. In 1987, Donna Rosenberg published one of the landmark reviews of what was then commonly called Munchausen Syndrome by Proxy. Rosenberg examined 117 cases reported in the literature and reported a mortality rate of approximately 9%.

Sixteen years later, Mary Sheridan published another major review. Her analysis examined 451 cases reported across 154 medical and psychosocial journal articles. Twenty-seven victims died, approximately 6%.

Now, in 2026, Wang and colleagues report 37 deaths among 469 victims, or 7.89%.

1987: approximately 9%.

2003: approximately 6%.

2026: 7.89%.

We should not treat those numbers as three independent epidemiological estimates of the true mortality rate. The reviews relied heavily on published cases, terminology and inclusion criteria evolved over time, and some cases represented in the literature may overlap.

Even with those limitations, the consistency is striking.

Across nearly four decades of published literature, fatal outcomes repeatedly appear in a disturbing proportion of reported cases. Whatever the true population-level mortality risk eventually proves to be, the practical lesson is difficult to dispute.

Munchausen-by-Proxy Abuse can kill children.

That fact should affect the urgency with which professionals respond when credible indicators begin accumulating.

THE MEDICAL SYSTEM CAN BECOME PART OF THE HARM

Munchausen-by-Proxy Abuse presents an unusual problem because the perpetrator does not necessarily have to personally inflict every injury. Sometimes the medical system unknowingly becomes part of the mechanism through which harm occurs. A false medical history can lead to diagnostic testing. Fabricated symptoms can lead to medication. Exaggerated impairment can lead to hospitalization. Persistent deception can produce increasingly invasive procedures, restrictions, medications, and interventions that the child never needed.

The professionals providing that treatment may be acting entirely appropriately based on the information available to them. The problem is that the information itself has been manipulated.

When the underlying medical narrative has been intentionally falsified, legitimate medical care can become a vehicle through which additional harm occurs. That is why independent verification matters so much in these cases.

WHO ACTUALLY SAW IT?

There is a simple question that should appear repeatedly during these investigations:

Who actually observed this?

Suppose a medical record states, “Mother reports the child experienced six seizures overnight.”

That record establishes an important fact. It establishes that the mother reported six seizures. It does not necessarily establish that six seizures occurred. Those are two different facts.

This distinction becomes even more important when information travels through multiple records. One caregiver statement can be documented by an emergency physician, repeated in a specialist's history, incorporated into another hospital record, and eventually described as part of the child's “documented medical history.” Five records may appear to corroborate one another when all five actually trace back to one original source.

Investigators must distinguish repeated information from independently corroborated information. That distinction can completely change how a case is understood.

SEPARATION IS MORE THAN A SAFETY DECISION

The Wang review reported that only 20.04% of victims were documented as having been separated from the perpetrator!

That number deserves careful interpretation. The review contains substantial missing and incomplete outcome data, so we cannot simply conclude that the remaining four out of five victims stayed with their suspected perpetrators.

But the finding raises an important question, particularly when considered alongside established professional guidance.

The American Professional Society on the Abuse of Children (APSAC), specifically addresses separation from a suspected abuser in its Munchausen by Proxy Clinical and Case Management Guidance. APSAC explains that separating a child from the suspected abuser is often necessary to objectively evaluate the child's wellbeing. Its guidance describes an escalating approach to separation, beginning in some cases with voluntarily removing the suspected caregiver from caregiving duties or hospital visitation and progressing to alternative placement when necessary.

APSAC's related diagnostic guidance also recognizes something critically important. Separation of the child from the caregiver, or increased independent monitoring, may result in the disappearance or reduction of signs and symptoms in some cases. In other words, separation can serve two purposes.

It can protect the child, and it can create a different observational condition under which professionals can evaluate what happens to the child's alleged illness. That brings us directly back to the Wang study. Two of the most common reasons Munchausen-by-Proxy Abuse was suspected were that symptoms appeared in the perpetrator's presence and improved in the perpetrator's absence.

That makes the reported 20.04% separation figure difficult to simply pass over. Again, the available data do not allow us to conclude that 79.96% of these victims were never separated. But they should cause us to ask a much more uncomfortable question:

How many children with suspected Munchausen-by-Proxy Abuse are being left in environments where professionals cannot adequately determine whether the suspected caregiver is causing, inducing, exaggerating, or falsely reporting the child's condition?

And if diagnostic separation is recommended professional guidance, how often is it actually being used?

If four out of five victims represented in this review were truly not separated, rather than merely having separation undocumented in the underlying publications, then we need to seriously examine whether children are being failed by inconsistent practices and failure to follow established professional guidance.

That question deserves further study.

Importantly, improvement during separation does not automatically prove Munchausen-by-Proxy Abuse. There may be legitimate medical, environmental, psychological, treatment-related, or behavioral explanations for the change. The purpose is not to assume the answer. The purpose is to create a testable question.

What changed?

Was it medication, diet, environment, stress, treatment, reporting, observation, or access to the suspected perpetrator?

The investigation should attempt to answer that question.

That is where medicine, child protection, and criminal investigation should complement one another. A carefully controlled and documented change in symptoms under different caregiving conditions may provide information that a personality assessment or caregiver interview never could.

THE SOLUTION IS INFORMATION SHARING

Wang and colleagues ultimately call for greater cross-departmental information sharing, multidisciplinary case conferences, structured risk assessment, better use of electronic health records to identify repeated or cross-institution medical utilization, and development of standardized databases capable of improving identification and research.

That recommendation reaches the heart of the problem.

Munchausen-by-Proxy Abuse can survive inside fragmented systems.

The pediatrician knows one part of the story. The hospital knows another. The school knows another. CPS knows another. The other parent knows another. The pharmacy knows another. Law enforcement knows another.

Each piece may have a reasonable explanation when viewed alone. The pattern may not.

That is why these investigations require multidisciplinary reconstruction. Professionals should move away from asking only, “Does this caregiver look like someone who would do this?”

Instead, we should ask what the evidence shows happened to this child over time. Who reported the symptoms? Who independently observed them? What did the testing actually establish? What happened when the caregiver was present? What happened when the caregiver was absent? Do the records agree? Do independent witnesses agree? What happened to siblings or other children previously in the caregiver's care? What does the complete chronology show?

Those questions move the investigation away from speculation about personality and toward observable evidence.

That may be the most important lesson from this new research.

Sometimes the evidence was there all along. It was simply scattered across too many people, too many records, and too many systems for anyone to see the pattern.

If you or anyone you know is suffering from Munchausen-by-Proxy Abuse, reach out to MunchausenSupport.com to connect with professionals who can help!