Brief psychotic disorder (BPD) can be triggered by a markedly stressful event or by childbirth. It can also occur for no apparent reason at all. There is some evidence that BPD is related to mood disorders; however, this association is considered controversial.  Prenatal exposure to stress increases the risk of postpartum BPD, as does a patient history of psychiatric symptoms. Some people may have a genetic vulnerability to BPD, and BPD occurs more frequently in people with family members who have had BPD. 
The pathophysiology of brief psychotic disorder (BPD) is unknown. The dysregulation of dopamine is implicated in the pathophysiology of schizophrenia; however, BPD occurs less commonly, thus making it difficult to study. Some data suggest that postpartum psychosis is an overt presentation of bipolar disorder, coinciding with the significant hormonal shifts that occur after delivery. 
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