Disorders are marked by disordered communication and thoughts, inappropriate emotions, and bizarre behaviors.

Schizophrenic disorders. Schizophrenia is a mental illness that needs to be treated by a doctor. Suffers of this illness frequently experience hallucinations, hear voices, become extremely paranoid, withdraw from their life, and can exhibit many other symptoms. Sometimes these bizarre episodes can happen for weeks or even months. During one of these time periods, the person with schizophrenia will not make much sense, and act erratic.