Postpartum psychosis, which is distinct from postnatal depression, is an episode of severe mental illness that normally occurs shortly after giving birth and escalates rapidly. Some groups of women are at greater risk, such as those who have experienced the condition previously, or those with bipolar disorder or schizoaffective disorder. However, postpartum psychosis can also affect women with no history of mental illness. Around 1,400 cases occur each year in the UK. With symptoms including hallucinations, delusions, mania, depression, and anxiety, women experiencing postpartum psychosis should receive specialist treatment. Although the condition can escalate quickly and should always be treated as a medical emergency, full recovery is possible. Often this includes medication and hospitalization. There is no evidence of any impact on the baby’s long term development.