This document discusses anxiety disorders as defined in the DSM-IV and DSM-5. It outlines the different types of anxiety disorders and provides details on separation anxiety disorder, including diagnostic criteria and case examples. Specifically, it describes how separation anxiety disorder involves unrealistic and excessive fear or anxiety about separation from important attachment figures. The fear must last at least 4 weeks in children/adolescents or 6 months in adults and cause impairment. Symptoms include physiological, emotional, cognitive and behavioral signs of anxiety when separating or anticipating separation. Treatment often involves psychotherapy like cognitive behavioral therapy, and sometimes medication.