Why Postpartum Psychosis Is So Often Misdiagnosed, Explained by a Psychiatrist

Postpartum psychosis affects an estimated 1 to 2 in every 1,000 deliveries, which makes it one of the least common conditions a mental health professional will encounter. Rarity is not a footnote here, but a core reason why the diagnosis may be missed.

Consider the arithmetic of a single clinician’s career. In more than four decades of psychiatric practice, only three cases of postpartum psychosis have knowingly come through this author’s office, and each looked strikingly different from the others. One patient developed the belief that her husband was deceiving and “messing with” her mind. Another, seen in a New York hospital in 1988, arrived showing severe signs of psychosis and mania, insisting on a fabricated identity. But only later did the team learn she had recently given birth, and the postpartum origin of her illness was recognized well after admission. A third, evaluated years ago, presented with manic symptoms and a conviction that her husband was looking “strange” and had somehow changed; she was diagnosed with bipolar mania and maintained on lithium for over a decade.

Three cases, three entirely different faces of the same illness. If an experienced psychiatrist sees the condition only a handful of times in a lifetime, a newer clinician – or a therapist, obstetrician, or nurse practitioner who has never encountered it – may not recognize it on their radar.

Much of maternal mental health screening is built around depression since postpartum depression and anxiety are far more common after giving birth. But the tools designed to catch them are not designed to catch psychosis. A standard depression questionnaire asks about sadness, guilt, and loss of interest; it does not ask, for example, whether a mother believes her baby is in supernatural danger or that her partner has been replaced. A psychotic mother can also look calm and lucid between episodes, since the symptoms wax and wane.

The American College of Obstetricians and Gynecologists recommends routine perinatal screening for depression and anxiety using validated questionnaires yet does not call for universal screening aimed specifically at psychosis, largely because the condition is so rare. The result is a real blind spot: a psychotic mother who does not screen as depressed can pass through a well-run system without her actual illness ever being named. Rising concern about broader maternal mental health has sharpened attention on this gap, but the screening mismatch remains.

One of the most important clues also happens to be one of the most overlooked. A 2016 review in the American Journal of Psychiatry describes postpartum psychosis as closely tied to the bipolar spectrum – essentially an atypical presentation of bipolar disorder triggered by childbirth, with symptoms that most often begin within the first two weeks after delivery. Individuals with bipolar disorder tend to respond to mood stabilizers such as lithium and to antipsychotic medication (when taken as prescribed) rather than to antidepressants alone.

This distinction has enormous practical weight. When the underlying illness is bipolar in nature, antidepressants given on their own may not address the problem and can sometimes worsen symptoms. Publicly reported testimony in the Clancy case described treatment with antidepressants, including sertraline (Zoloft). When a postpartum patient cycles through multiple antidepressant trials without meaningful improvement, that lack of response is a signal that the diagnosis may be inaccurate. Medications are appropriate only when prescribed by a clinician and taken exactly as prescribed, and finding the right one is a careful process handled through medication management. A pattern of repeated medication changes without noted progress should prompt a fresh look at what is actually being treated.

There is a further trap. Because most women with postpartum depression recover within a few months, the bipolar connection can be hard to confirm in the moment. On the other hand, a smaller group of women in the postpartum stage do go on to develop classic bipolar disorder and need long-term treatment. The same illness can therefore look like a one-time crisis in one patient and a lifelong mood disorder in another.

Several forces line up to keep postpartum psychosis hidden. The first is training. Although earlier editions of psychiatry’s diagnostic manual listed postpartum psychosis, it carries no standalone code in the current Diagnostic and Statistical Manual of Mental Disorders (DSM-5), or the U.S.’s mental health guidebook. As a result, U.S. textbooks, courses, and clinical training often give it little attention, and clinicians may never be taught to look for it. On the contrary, the World Health Organization International Classification of Diseases (ICD) and subscribing European nations do acknowledge postpartum psychosis.

The second is the illness itself. Patients often have enough insight during lucid periods to hide their most frightening thoughts, especially from authority figures, out of a very real fear of hospitalization or losing custody of their children. The distressing or delusional thoughts that accompany postpartum psychosis are not the same as the fleeting, unwanted intrusive thoughts that many anxious new parents experience. A delusion feels completely true to the person living it, which is exactly why a new mother may not report it.

The third is disconnected care. A new mother may be seeing an obstetrician, a therapist, a prescriber, and sometimes an inpatient team, each holding a single puzzle piece. Cross-examination in the Clancy case highlighted exactly this danger: providers who were not comparing notes. When no one connects the fragments, the larger psychiatric picture may not come into focus, so a disjointed care model likely makes diagnosis more difficult.

Because the illness disguises itself so well, catching it depends less on a single test than on a thorough, deliberate evaluation. In practice, several steps make the difference:

• Consider it by default. Any unusual thinking or behavior in a woman who has recently given birth should raise postpartum psychosis as a possibility, even when she does not look depressed.
• Interview the family, not just the patient. Because mothers frequently conceal psychotic thoughts (out of fear), input from a spouse, parent, sibling, or friends is often what reveals the true picture. Experienced clinicians insist on speaking with those closest to her.
• Prioritize an in-person evaluation when someone is not improving. Subtle changes in affect, expression, and behavior are easier to read face-to-face than on a screen, and judicious in-person visits matter most precisely when a patient is doing poorly.
• Coordinate across providers. A connected, team-based approach, and the idea behind a collaborative care model, help ensure that a therapist, prescriber, and obstetrician are not working from partial views.

Families should never dismiss dramatic personality changes, unusual beliefs, paranoia, or a sudden loss of touch with reality in the weeks after a birth. Postpartum psychosis is a medical emergency, and it warrants urgent in-patient hospitalization, preferably in a dedicated mother-baby psychiatric unit. If symptoms like these appear, seek care immediately rather than waiting to see whether they pass. When there is any concern about a mother’s or infant’s safety, contact emergency services or go to the nearest emergency room.

The most hopeful part of this difficult subject is that the illness is often treatable once it is correctly identified. Getting to the right diagnosis, and the right care, is what allows that kind of improvement to reach the mothers who need it. If something does not feel right after giving birth, keep asking questions until the concern is fully addressed.

Availability of specific services and insurance coverage vary, so it is worth confirming both when seeking care.