The Third Category of Mental Disorders
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Based on the present status of our clinical knowledge of psychiatry, we can roughly divide mental disorders into three major categories: organic mental disorders, psychotic disorders and nonorganic, nonpsychotic mental disorders.
Organic Mental Disorders
Mental disorders due to brain diseases, brain injuries, or developmental brain disorders
Mental disorders due to physical or medical diseases
Mental disorders due to psychoactive substance use
Paranoid or delusional disorder
Manic-depressive illness. The depressive phase (especially in unipolar depression) should possess the following characteristics: (a) markedly depressed mood with (b) psychomotor retardation. The course of the disease shows an episodic pattern; in other...