Agoraphobia is an anxiety disorder that involves the fear of experiencing a panic attack in a place or situation from where escape may be difficult or embarrassing.

Agoraphobia is generally associated with the fear of being out in the open, but that isn't strictly true. People suffering from agoraphobia are more often fearful of places where they are crowded in.

Situations involving being in a crowded building, a long hallway, a large, open place or any unfamiliar territory can be intensely disturbing, making the sufferer feel exposed and unprotected.