Agoraphobia is a fear of being in places where help might not be available. It usually involves fear of crowds, bridges, or of being outside alone.
Agoraphobia often accompanies another anxiety disorder, such as panic disorder or a specific phobia. If it occurs with panic disorder, it usually starts in a person's 20s, and women are affected more often than men.
Moore DP, Jefferson JW. Agoraphobia (panic disorder with agoraphobia and agoraphobia without history of panic disorder). In: Moore DP, Jefferson JW, eds. Handbook of Medical Psychiatry. 2nd ed. Philadelphia, Pa: Mosby Elsevier;2004:chap 84.
Katon W, Geyman JP. Anxiety disorders. In: Rakel RE, ed. Textbook of Family Medicine. 7th ed. Philadelphia, Pa: Saunders Elsevier;2007:chap 57.