A psychosis is any major mental disorder of organic or emotional origin that is marked by a derangement of personality and loss of contact with reality. A psychosis is characterised by loss of insight into the fact that one is mentally ill, usually as part of a more general disturbance of the normal relationship between reality and imagination, fact and fantasy.
The two most important symptoms of a psychotic disorder are hallucinations and delusions.
These are defined in the ICD-9 categories 290-298.
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