<unk>  is a period of psychosis whose duration is less than a month.  The disorder is characterized by a sudden onset of psychotic symptoms, which may include delusions, hallucinations, disorganized speech or behavior, or catatonic behavior. The symptoms must not be caused by schizophrenia, schizoaffective disorder, delusional disorder or mania in bipolar disorder. They must also not be caused by a drug (such as amphetamines) or medical condition (such as a brain tumor).
Brief psychotic disorder
Brief reactive psychosis
Disorganized schizophrenia
Schizoaffective disorder
Bipolar disorder mixed state
Paranoid Schizophrenia
Atypical depression
Substance or medication induced psychotic disorder