Phobias are the type of anxiety disorders, in which an individual has a strong and irrational fear of something. For instance, acrophobia fear of heights, agoraphobia fear of public places, and claustrophobia fear of closed-in places. All type of phobia usually starts in childhood and carried into the adulthood. According to a recent survey, it is estimated that 10 million people in the UK have phobia. Symptoms Of .