Could you be a hypochondriac (ten yes-no questions)? Is your headache caused by not eating? tension? something more serious? How about your stomach ache? Do you know how to relax? (""Outsmart your brainstem"" with biofeedback, TM, yoga, or just a hobby.) Conversationally, Stiller discusses anorexia and mono; erections and the signs of VD. For those who haven't encountered such messages elsewhere, he hands out sensible advice: acne is not caused by dirt, sex, or chocolate, and there is no ""cure"" but time though there are treatments. Hives might be caused by emotions, medicines, or food dyes. You are probably not impotent or frigid or gay despite a bad first experience. Beware of crash diets, diet pills, and sleeping pills; and don't hide from your feelings behind drugs, legal or illegal. Stiller doesn't go far enough into any specific topic to serve as a look-it-up medical reference, and what he has to say about their problems won't be much help to bed-wetters, for example, or those with low self-esteem who need more than the admonishment to ""Think well of yourself."" On the other hand, he won't alarm hypochondriacs or encourage dangerous self-diagnosis and treatment, and he might help the anxious or befuddled youngster to put his/her body's messages in perspective.