Psychosis has many causes. Psychiatrists typically receive the most thorough training in its diagnosis, but the diagnosis of psychosis secondary to nonpsychiatric conditions is not often emphasized. An understanding of the underlying cause of psychosis is important for effective management. The Diagnosis of Psychosis bridges the gap between psychiatry and medicine, providing a comprehensive review of primary and secondary causes of psychosis. It covers both common and rare causes in a clinically focused guide. Useful both for teaching and reference, the text covers physical and mental state examination, describes key investigations, and summarizes the non-psychiatric features of medical conditions causing psychosis. Particularly relevant for psychiatrists and trainees in psychiatry, this volume will also assist neurologists and general physicians who encounter psychosis in their practice.