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As a result of the fear, the person endures certain social situations in extreme distress or may avoid them altogether. In addition, people with social anxiety disorder often suffer "anticipatory" anxiety -- the fear of a situation before it even happens -- for days or weeks before the event. In many cases, the person is aware that the fear is unreasonable, yet is unable to overcome it.

People with social anxiety disorder may be afraid of a specific situation, such as speaking in public. However, most people with social anxiety disorder fear more than one social situation. Other situations that commonly provoke anxiety include:
Being the center of attention.
Interacting with people, including dating or going to parties.
Asking questions or giving reports in groups.
Talking on the telephone.

Many people with social anxiety disorder feel that there is "something wrong," but don't recognize their feeling as a sign of illness. Symptoms of social anxiety disorder can include:

Intense anxiety in social situations.
Avoidance of social situations.

There is no single known cause of social anxiety disorder, but research suggests that biological, psychological, and environmental factors may play a role in its development.
Psychological: The development of social anxiety disorder may stem from an embarrassing or humiliating experience at a social event in the past.
Environmental: People with social anxiety disorder may develop their fear from observing the behavior of others or seeing what happened to someone else as the result of their behavior (such as being laughed at or made fun of).