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This is a clinician-written, evidence-based summary aligned to the 2026 MLA Content Map. It is intended for medical students and junior doctors preparing for the UKMLA. Always cross-reference with NICE guidance, local protocols, and clinical judgement.
Key points
- Acute-onset psychotic illness within first 2–4 weeks postpartum — PSYCHIATRIC EMERGENCY
- Rapid onset: confusion, perplexity, labile mood, grandiose or paranoid delusions, hallucinations, bizarre behaviour
- Affects ~1–2 per 1,000 births. Strongest risk factor: personal/family history of bipolar disorder (25–50% recurrence risk)
- Management: urgent admission to Mother and Baby Unit (MBU) — antipsychotic + mood stabiliser (lithium) ± benzodiazepine
- Excellent prognosis for the episode (majority recover fully) but high recurrence risk in subsequent pregnancies
- Risk to mother (suicide) and baby (infanticide) — both rare but require careful assessment and supervision
Overview
Puerperal psychosis (postpartum psychosis) is a severe psychiatric emergency with acute onset typically within the first 2–4 weeks after childbirth. It is characterised by a rapidly evolving and fluctuating presentation including confusion, perplexity, insomnia, labile mood (mania, depression, or mixed), grandiose or persecutory delusions (often involving the baby), auditory and visual hallucinations, and bizarre or disorganised behaviour. The clinical picture often resembles an acute affective psychosis (bipolar mania or mixed episode) rather than schizophrenia. It is strongly associated with bipolar disorder — in up to 50% of cases, puerperal psychosis represents the first episode of bipolar illness. Without treatment, there is a risk of harm to both mother (suicide) and baby (neglect or infanticide, though rare).
Epidemiology
Puerperal psychosis affects approximately 1–2 per 1,000 deliveries. The strongest risk factor is a personal history of bipolar disorder (25–50% recurrence risk per pregnancy) or previous puerperal psychosis (25–50% recurrence). Primiparity is an independent risk factor. Other risk factors include family history of bipolar disorder or puerperal psychosis, sleep deprivation, and obstetric complications. The condition is equally prevalent across ethnic groups and socioeconomic strata. Despite its severity, the prognosis for the acute episode is good with appropriate treatment — the majority of women recover fully, though the risk of future mood episodes (within and outside the perinatal period) is high.
Clinical Features
Symptoms
Acute onset: typically within 2–4 weeks postpartum, often very rapid (hours to days)
Confusion, perplexity, bewilderment — "not herself"
Insomnia: severe, often the earliest symptom — may go days without sleeping
Labile, rapidly fluctuating mood: elation, irritability, depression, or mixed
Grandiose or persecutory delusions, often involving the baby (e.g. baby is divine, or in danger)
Hallucinations: auditory and visual
Disorganised, bizarre behaviour — may put baby at risk through neglect or misguided actions
Risk of suicide and (rarely) infanticide — both require careful assessment
Signs
Rapidly changing mental state — may appear well one moment, then acutely disturbed
Elated or irritable mood, pressured speech, reduced sleep (manic features)
Suspiciousness, agitation, poor insight
May have difficulty caring for the baby safely
Investigations
First-line
Urgent psychiatric assessmentMental state examination, risk assessment (to mother AND baby), collateral history from partner/family
Exclude organic causesBloods: FBC, CRP, U&Es, TFTs, calcium, glucose. Consider sepsis screen, urinalysis, blood cultures if febrile
Second-line
CT/MRI headIf focal neurology or atypical presentation — exclude cerebral venous sinus thrombosis (CVST), which can present with psychosis postpartum
Autoimmune encephalitis screenAnti-NMDA receptor antibodies if atypical features (young woman, seizures, movement disorder) — can present in postpartum period
Specialist
Specialist perinatal psychiatric assessmentUrgent referral to perinatal mental health team. Consider: is this first episode of bipolar disorder?
1
Urgent admission
- Admit to Mother and Baby Unit (MBU) — ALWAYS preferred over general psychiatric ward (keeps mother and baby together)
- If no MBU available: general psychiatric ward with arrangements for baby care — not ideal
- May require detention under Mental Health Act if lacking capacity/insight and refusing voluntary admission
2
Pharmacological treatment
- Antipsychotic: olanzapine or quetiapine (atypicals preferred — lower EPS risk)
- Lithium: consider early if bipolar features (may prevent further episodes). Contraindicated if breastfeeding
- Benzodiazepine (lorazepam) for acute agitation, insomnia, distress — short-term
- If breastfeeding: discuss risks/benefits. Some antipsychotics compatible with breastfeeding (olanzapine, quetiapine at low doses) — specialist advice needed
3
Supportive care
- Ensure adequate sleep (severe insomnia worsens psychosis) — supervised baby care overnight to allow mother to sleep
- Support mother-baby bonding as psychosis resolves
- Psychological support for mother, partner, and family — the experience is frightening for all
4
Follow-up and future pregnancy planning
- Monitor for recurrence and emerging bipolar disorder
- Preconception counselling: 25–50% recurrence risk in subsequent pregnancies
- Consider prophylactic lithium immediately postpartum in women with history of puerperal psychosis or bipolar disorder
- Document in maternity notes and share with obstetric team for future pregnancies
Complications
- Suicide: Risk is real though rare — maternal suicide is a leading cause of postpartum maternal death
- Infanticide: Very rare but devastating — careful risk assessment and supervised mother-baby contact during acute illness
- Impaired bonding: Acute psychosis disrupts early attachment — support bonding during recovery
- Recurrence: 25–50% in subsequent pregnancies; high lifetime risk of bipolar disorder episodes
- Psychological trauma: The experience of psychosis and potential separation from baby is distressing — offer psychological support
UKMLA Exam Tips
- 1Puerperal psychosis onset: days 2–14 postpartum typically. Rapid, dramatic onset — confusion, insomnia, labile mood, delusions
- 2Baby blues = day 3–5, self-limiting. PND = persistent low mood >2 weeks. Puerperal psychosis = acute onset, confusion, mania, psychosis
- 3Strongest risk factor: bipolar disorder or previous puerperal psychosis (25–50% recurrence)
- 4Mother and Baby Unit (MBU) admission — ALWAYS preferred. Do not separate mother and baby unless absolutely necessary
- 5Consider CVST (cerebral venous sinus thrombosis) in postpartum psychosis with headache or focal neurology — MRI venogram
- 6Lithium is CONTRAINDICATED in breastfeeding. Olanzapine/quetiapine are safer options if breastfeeding is important to the mother
- 7Up to 50% of puerperal psychosis cases are the FIRST EPISODE of bipolar disorder — long-term follow-up is essential
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