Anxiety is a complex combination of the feelings of fear, dread, apprehension, and worrying behavior that may produce physical sensations such as heart palpitations, chest pain and/or shortness of breath. It may exist as a primary brain disorder or may be associated with other medical problems including other psychiatric disorders. A chronically recurring case of anxiety that has a serious effect on your life may be clinically diagnosed as an anxiety disorder. The most common are Generalized Anxiety Disorder, Panic Disorder, Social Anxiety Disorder, Phobias, Obsessive-Compulsive Disorder, and Posttraumatic Stress Disorder (PTSD).