This book gives the Arabized psychiatric medical term, based on what is commonly used in scientific and medical books approved in Arab universities, according to what is stated in the Unified Medical Dictionary. It motivates all workers in the field of mental health, and students specializing in psychological sciences, to adhere to the standards of mental illness, thus avoiding inaccurate diagnosis and the resulting errors in treating illnesses. It consists of eighteen chapters, covering everything related to the indicators and symbols adopted in diagnosing mental illnesses and all psychological disorders. It is a guide for every psychologist, therapist, or intellectual who wishes to enrich his knowledge about psychiatry and mental illness.