Psychosis is a mental and behavioral disorder in which a person has
trouble telling the difference between what is real and what is not real. It
may cause bizarre thoughts and behavior.
A person with psychosis may have:
Delusions, which are firmly held but false
beliefs. Irrational suspicion of others (paranoia) is a common delusion. The
person may think others are watching or trying to hurt or even kill him or
Hallucinations, which are false perceptions. Hallucinations
can include seeing, hearing, feeling, smelling, or tasting things that are not
Treatment for psychosis depends on the cause and may include care
in a hospital. Medicines that diminish hallucinations and delusions and
stabilize thinking and behavior are helpful. Group or individual therapy also
may be helpful.