Environmental Influences and Onset of Schizophrenia

Abstract

Although the genetic factor plays an important role in schizophrenia it is not considered a sufficient cause of the illness. Twin and family studies showed that a psychotic family member or occasionally a non-psychotic family member may exert adverse influence upon other members as a non-specific stress. Anti-cholinergic and sympathomimetic drugs and certain seasonal factors may facilitate the onset or relapse. Head injury or history of birth complications may increase susceptibility to schizophrenia.