The document discusses several types of anxiety disorders including panic disorder, obsessive compulsive disorder, and post-traumatic stress disorder. It explains the physiology of anxiety and how the sympathetic nervous system responds to fearful stimuli. Panic disorder is characterized by unexpected panic attacks involving physical symptoms. Obsessive compulsive disorder involves recurrent obsessions and compulsions. Post-traumatic stress disorder is a prolonged reaction to a traumatic experience and causes avoidance behaviors, re-experiencing of trauma, and heightened arousal. Cognitive behavioral therapy is an effective treatment approach for these disorders.

1. Anxiety Disorders