The high-profile trial of Lindsay Clancy, a former nurse accused of killing her three young children, has brought renewed attention to postpartum psychosis and exposed significant gaps in medical knowledge and classification of the condition. Clancy’s defense attorneys argued she was experiencing postpartum psychosis at the time of the alleged crimes, pointing to symptoms including anxiety, insomnia, depression, and searches for terms such as “psychosis” on her computer. A mistrial was declared on September 4 after jurors deadlocked despite deliberating for more than a week.
Postpartum psychosis is a severe psychiatric condition characterized by symptoms including mania, depression, psychotic features, and mixed episodes. Researchers estimate the illness occurs in one to two per 1,000 women after delivery, equivalent to approximately 3,600 US mothers annually. Onset can be sudden or gradual and is typically severe. Experts believe the condition may be related to bipolar disorder and could have a genetic basis triggered by immune system changes and hormonal fluctuations associated with pregnancy.
Despite being reported since ancient Greek times, postpartum psychosis remains poorly understood among medical professionals and the general public. The condition currently lacks formal classification in the Diagnostic and Statistical Manual of Mental Disorders (DSM-5), the standard reference for psychiatric diagnoses. Medical doctors, gynecologists, and psychologists often receive limited education on the illness, contributing to diagnostic and treatment delays. The absence of formal classification also creates obstacles to research funding and provider education.
Experts emphasize that infanticide remains incredibly rare among women with postpartum psychosis. The UK experiences roughly 1,200 cases annually, with only “a few cases per decade” involving infanticide, according to psychologist Jessica Heron. By contrast, infant homicide rates are approximately 7.11 per 100,000 in the US. Women with postpartum psychosis face higher risk of self-harm. Research indicates the condition responds well to treatment with lithium and electroconvulsive therapy, yet awareness gaps persist both among medical professionals and the public.
Advocates and researchers are pushing for formal inclusion of postpartum psychosis in the DSM-5, arguing that classification would improve research funding, provider education, and patient care. The process for adding new diagnoses requires rigorous evaluation by expert committees, and decisions about criteria and placement remain under discussion.
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