Psychosis is a general term which refers to any significant mental disorder that has a physical or emotional source. It is a severe disturbance in which a person is unable to distinguish reality from fantasy.
Psychosis is considered a mental and behavioral disorder. It results in a significant distortion of a person's mental capacity. The person has problems recognizes reality and relating to other people. These distortions are serious enough to interfere with the person's ability to deal with the normal demands of everyday life.
Psychotic illnesses can have a physical or emotional cause. The causes include such disorders as: