PLYMOUTH, Mass. – The murder trial of Lindsay Clancy has brought renewed attention to postpartum psychosis, a rare psychiatric emergency that specialists say can cause a rapid and profound loss of contact with reality after childbirth.
Clancy does not dispute that she killed her three children in January 2023. She has pleaded not guilty to murder charges, and her lawyers argue that she was experiencing postpartum psychosis and could not understand the wrongfulness of her actions. Prosecutors contend the killings were intentional and planned. The jury must decide her criminal responsibility under Massachusetts law, not whether the illness exists.
A defense psychologist testified that Clancy was unable to appreciate the wrongfulness of what she did. Jurors have also heard evidence about her mental-health treatment, medication history, insomnia, online searches and statements to relatives before the deaths. Her mother testified that Clancy had reported thoughts of harming the children and said she did not feel like herself.
Postpartum psychosis can involve hallucinations, delusions, mania, severe depression, agitation, confusion, paranoia and dramatic mood changes. Symptoms can appear suddenly and fluctuate, sometimes making a person seem well shortly before a crisis. Experts interviewed by the BBC said that unpredictability is one reason the condition requires emergency evaluation.
The illness is different from the more common postpartum depression and anxiety, although symptoms can overlap. A history of bipolar disorder or a previous psychotic episode can increase risk, but some patients have no known history before childbirth. Hormonal changes, severe sleep loss and other stresses may contribute.
Treatment can include hospitalization, mood stabilizers such as lithium, antipsychotic medication and, in some cases, electroconvulsive therapy. Specialists emphasize that recovery is possible with prompt care. The immediate safety of the mother and children takes priority when hallucinations, delusions, suicidal thinking or thoughts of harm are present.
The trial has also highlighted a classification gap. Postpartum psychosis is not listed as a stand-alone diagnosis in the Diagnostic and Statistical Manual of Mental Disorders, the reference used by many U.S. clinicians, insurers and researchers. Advocates say formal criteria could improve medical education, research funding, insurance coding and consistent treatment.
Experts caution against using a single criminal case to define everyone who experiences the illness. Most people with mental-health conditions are not violent, and patients with postpartum psychosis need care rather than stigma. Still, the condition carries an elevated risk of suicide and harm to an infant when untreated, making warning signs an urgent medical matter.
Anyone who is hallucinating, expressing fixed false beliefs, unable to sleep for prolonged periods, talking about suicide or threatening harm should not be left alone. In the United States, people can call or text 988 for crisis support, call 911 in an immediate emergency or seek an emergency-room evaluation.
Source: BBC News, published Aug. 19, 2026. Additional verification: Associated Press trial coverage and medical expert guidance cited by the BBC.
