Panic Disorder is a type of anxiety disorder characterized by recurrent, unexpected panic attacks. A panic attack is a sudden and intense episode of fear or extreme discomfort that often comes on without warning and reaches its peak within minutes. Panic attacks can be very distressing and are often accompanied by physical symptoms such as a rapid heart rate, sweating, trembling, shortness of breath, chest pain, and a feeling of impending doom. Unfortunately, panic attack disorder tends to have a cumulative effect, where panic attacks start to be such a fear provoking event that anticipatory anxiety actual create further attacks.