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Updated: Jan 9, 2026

Using a Murine Model of Psychosocial Stress in Pregnancy as a Translationally Relevant Paradigm for Psychiatric Disorders in Mothers and Infants
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Sibling Psychiatric Disorders and Risk of Postpartum Psychosis.

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Summary

Familial psychiatric history, particularly bipolar disorder and schizoaffective disorder in siblings, significantly increases the risk of postpartum psychosis. This highlights the genetic links and supports viewing postpartum psychosis within severe mood disorders.

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Area of Science:

  • Psychiatry
  • Genetics
  • Reproductive Health

Background:

  • Postpartum psychosis (PP) affects 1-2 per 1,000 women.
  • Established risk factors include bipolar disorder and prior PP.
  • The role of familial psychiatric history in PP risk is not well understood.

Purpose of the Study:

  • To investigate the association between sibling psychiatric diagnoses and the risk of postpartum psychosis.
  • To determine if familial psychiatric history contributes to PP risk, especially in women without prior psychiatric conditions.

Main Methods:

  • Utilized Swedish national registers to identify 1,213,829 women with a full sibling who delivered between 1980-2017.
  • Defined postpartum psychosis as mania, psychosis, or psychotic depression within 90 days postpartum.
  • Employed logistic regression to estimate associations, controlling for the woman's own psychiatric history.

Main Results:

  • 1,831 women (1.5 per 1,000) developed postpartum psychosis.
  • Strongest associations found for sister's PP (OR 10.84), cyclothymia (OR 8.29), schizoaffective disorder (OR 7.90), and bipolar disorder (OR 5.00).
  • Sibling diagnoses significantly increased PP risk, particularly in women with no prior psychiatric history.

Conclusions:

  • Postpartum psychosis exhibits strong familial aggregation, with risks linked to various sibling diagnoses.
  • The pattern of associations, especially with bipolar, cyclothymia, and schizoaffective disorders, suggests PP is part of the severe mood disorder spectrum.
  • Familial psychiatric history is a significant, often overlooked, risk factor for postpartum psychosis.