Anxiety Disorders: Diagnosis and Clinical Management - Hardcoverby Peter Garner (Editor) Anxiety disorders are a group of mental illnesses associated with constant and overwhelming feelings of anxiety and fear. There are several types of anxiety disorders, namely, generalized anxiety disorder, panic disorder, social anxiety disorder, agoraphobia, separation anxiety, selective mutism, etc. Some common signs and symptoms of anxiety disorders are panic, fear, uneasiness, sleep problems, shortness of breath,