<unk>  is a type of mental illness that is characterized by psychosis and closely related to schizophrenia. Both schizophrenia and<unk> , as defined by the Diagnostic and Statistical Manual of Mental Disorders (DSM-IV-TR), have the same symptoms and essential features except for two differences: the level of functional impairment and the duration of symptoms. Impairment in social, occupational, or academic functioning is usually present in schizophrenia, particularly near the time of first diagnosis, but such impairment may or may not be present in<unk> . In<unk> , the symptoms (including prodromal, active, and residual phases) must last at least 1 month but not more than 6 months, while in schizophrenia the symptoms must be present for a minimum of 6 months.
Schizophreniform disorder
Schizoaffective disorder
Disorganized schizophrenia
Schizophrenia
Bipolar disorder not otherwise specified
Simple-type schizophrenia
Bipolar I disorder
Post-schizophrenic depression