The exact cause of the disorder remains unknown, and relatively few studies have focused exclusively on the etiology of<unk> . Like other psychotic disorders, a diathesis–stress model has been proposed, suggesting that some individuals have an underlying multifactorial genetic vulnerability to the disorder that can be triggered by certain environmental factors.<unk>  is more likely to occur in people with family members who have schizophrenia or bipolar disorder.
Schizophreniform disorder
Schizoaffective disorder
Disorganized schizophrenia
Schizophrenia
Bipolar disorder not otherwise specified
Simple-type schizophrenia
Bipolar I disorder
Post-schizophrenic depression