A phobic person understands that the fear is excessive or groundless. But the effort to resist it only brings more anxiety. Phobias often begin in childhood and are irrational and disabling fears that produce a compelling desire to avoid the dreaded object or situation.

Specific phobias are the most common -- involving things such as germs, bugs, school, dentists, driving, water, balloons, snakes, high places (acrophobia), and enclosed spaces (claustrophobia). The fear is usually not of the object itself but of some dire outcome, such as falling from an airplane. 

Someone with agoraphobia suffers multiple fears that have three main themes: fear of leaving home, of being alone, and of being in a situation where one cannot suddenly leave or obtain help. When fear is at its peak, the agoraphobic may go to almost any lengths to avoid leaving home.

In social phobia, a person's central fear is of being humiliated in public. People with this kind of phobia may even balk at eating in a restaurant. They avoid public speaking, parties and public restrooms. Such situations and places may bring blushing, palpitations, sweating, tremors, stuttering, or faintness. As many as 25% of professional performers struggle with severe, lifelong performance anxiety -- a form of social phobia. A person whose phobia is left untreated may become withdrawn, depressed, and socially incapacitated.

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