Do you ever have butterflies before giving a speech or feel uncomfortable entering a room full of strangers? Everyone has at least a brush with social or performance anxiety. But for more than 20 million Americans -- men, women, and children from all walks of life -- these problems are an everyday occurrence, often depriving them of success and happiness.

Using dozens of cases like these, Drs. Schneier and Welkowitz illustrate the many puzzling forms of social anxiety and the experiences that trigger it. In addition they offer several simple "self-tests" to help you measure your own...