Written by Pam MS, NCSP | Fact checked by Psychology Dictionary staff 

Any severe mental disorder characterized by impairment of function in life. The accuracy of perception and thought is severely diminished and incorrect assessments of reality are prevalent, even in the face of sound evidence to the contrary. A psychotic disorder may have symptoms of delusion, hallucination and disorganized thoughts and behavior. Such symptoms lead to a major diminishment of function.

PSYCHOTIC DISORDER: "Paula's psychotic disorder was taking over her life."

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