PARANOIA, the mental infringement, described suspiciousness and well proved system of the supervaluable ideas getting at excessive expressiveness character of delirium. At sick of a paranoia there is no elaborate behaviour, emotional instability, grotesque hallucinations and the unusual ideas marked at other psychopathological conditions. Many of them are capable to support economic and social adaptation. Sick of a paranoia seldom address for the help. As a result the research based on supervision and treatment, appears impossible. Now in medicine there are no specific ways of treatment of these conditions.