Unlike the Diagnostic and Statistical Manual of Mental Disorders IV, the DSM-5 does not list any schizophrenic subtypes, according to PsychCentral. Previously, the DSM-IV divided schizophrenia into five subtypes: paranoid, disorganized, catatonic, undifferentiated and residual.
The American Psychiatric Association removed the previous schizophrenic subtypes due to their "limited diagnostic stability, low reliability and poor validity," reports PsychCentral. The American Psychiatric Association did not feel that the schizophrenic subtypes helped provide better targeted treatment or helped to predict the treatment response.
According to the DSM-5, two symptoms from Criterion A are necessary for a significant portion of a 1-month period for a diagnosis of schizophrenia, reports HealthCentral. Criterion A lists delusions; hallucinations; disorganized speech; grossly disorganized or catatonic behavior; and negative symptoms, such as affective flattening, alogia or avolition as cause for a diagnosis of schizophrenia. However, one of the two Criterion A symptoms must be one of the "positive" schizophrenia symptoms (hallucinations, delusions or disorganized speech), states PsychCentral.
Schizophrenia usually manifests in early adulthood or late teens, and it affects more men than women, claims PsychCentral. There is no cure; however, schizophrenia treatments combine medication and behavioral therapy to control hallucinations and delusions, while helping patients learn to function in society.