Schizophrenia affects two percent of the world's population. Schizophrenia is not multiple personality disorder. Schizophrenia is primarily a result of irregularities in the working of dopamine, a natural neurochemical that facilitates message transmission among brain cells.

Characteristics of schizophrenia: preoccupation, disordered thoughts and statements, auditory hallucinations and delusions. The line separating what schizophrenics imagine from what they actually experience disappears, and so does their control over the behavior that issues from this confusion.