Panic disorder without agoraphobia—A person with this disorder suffers from recurrent panic attacks and worries about experiencing more attacks, but agoraphobia is not present. Panic attacks are sudden attacks of intense fear or apprehension during which the sufferer may experience shortness of breath, increased heart rate, choking, and/or a fear of losing control. Agoraphobia is anxiety about places or situations from which escape might be difficult, or in which help might not be available.

Panic disorder with agoraphobia—A person with this disorder also experiences recurrent panic attacks but also has agoraphobia. The anxiety about certain places or situations may lead to avoidance of those places or situations.

Agoraphobia without history of panic disorder—The person with this disorder suffers from agoraphobia and experiences panic-like symptoms but does not experience recurring panic attacks.