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The term [[psychosis]] arose in [[psychiatry]] in the nineteenth century as a way of designating [[treatment|mental illness ]] in general.

During [[Freud]]'s life, a basic distinction between [[psychosis]] and [[neurosis]] came to be generally accepted, according to which [[psychosis]] designated extreme forms of [[mental illness ]] and [[neurosis]] denoted less serious disorders.

This basic distinction between [[neurosis]] and [[psychosis]] was taken up and developed by [[Freud]] himself in several papers.<ref>Freud, {{F}} p.1924b . "Neurosis and 1924ePsychosis." SE XIX. p.149.</ref>