A condition in which a person has excessive worry and feelings of fear, dread, and uneasiness. Other symptoms may include sweating, restlessness, irritability, fatigue, poor concentration, trouble sleeping, trouble breathing, a fast heartbeat, and dizziness. The symptoms can get worse over time and affect a person’s day-to-day life. Anxiety disorders may be caused by a medical problem, a traumatic or stressful event, certain medicines, or other factors. There are many types of anxiety disorders, including generalized anxiety disorder, social anxiety disorder, panic disorder, post-traumatic stress disorder, and phobia-related disorders.