Agoraphobia (ag-uh-ruh-FOE-be-uh) is a type of anxiety disorder in which you fear and avoid places or situations that might cause you to panic and make you feel trapped, helpless or embarrassed. You fear an actual or anticipated situation, such as using public transportation, being in open or enclosed spaces, standing in line, or being in a crowd.
The anxiety is caused by fear that there's no easy way to escape or get help if the anxiety intensifies. Most people who have agoraphobia develop it after having one or more panic attacks, causing them to worry about having another attack and avoid the places where it may happen again.