Schizophrenia is a serious brain disorder in which people interpret reality abnormally. Schizophrenia may result in some combination of hallucinations, delusions and disordered thinking and behavior. The ability of people with schizophrenia to function normally and to care for themselves tends to deteriorate over time.
Schizophrenia varies in severity from person to person. Some people have only one psychotic episode while others have many episodes during a lifetime but lead relatively normal lives between episodes. Schizophrenia symptoms seem to worsen and improve in cycles known as relapses and remissions.