What is Schizophrenia
The mental illness in which psychosis most commonly occurs is schizophrenia. Contrary to common believe schizophrenia does not mean split personality. The symptoms of schizophrenia include such things as delusions and hallucinations.
Most people experience the onset of schizophrenia between the ages of 15 to 30 years, thus coinciding with the main period of social and educational achievement in life. Schizophrenia affects males more than females and males tend to develop it earlier. The onset of the illness may be rapid, with symptoms developing over several weeks or it may be slow and develp over months or years.
(Information Mental Health First Aid Manual)