What's the cause of postpartum psychosis?

We're not really sure what causes postpartum psychosis. Fluctuations in hormones and sleep patterns could play a role, and there does seem to be a genetic basis, as a woman is more likely to develop the illness if her close relative had it. There seems to be link between postpartum psychosis and bipolar disorder . It's important to understand that postpartum psychosis is not caused by anything the woman did, nor is it caused by stress, relationship problems or a baby being unwanted.
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