thinning of the scalp hair take place as a normal part of the process of aging. However, many types of abnormal hair loss also occur. Some kinds of baldness involve only a thinning of the hakr from one small area of the scalp. But in the most common type, called male pattern baldness, a man loses much or all of the hair over the top of the head. A smaller number of women have a comdition known as female pattern baldness, which involves thinning of the hair but usually not complete baldness. A healthy scalp sheds old hairs continually, and new ones grow to replace them. Baldness develops when new hair stops growing for any reason. In male pattern baldness, hair loss results from the combination of an ingerited trait and the effects of the hormone testoterone. Loss of hair may begin duting the teen-age years or at any later time. Pattern baldness cannot be cured. However,many types of baldness are timporary, and normal hair growth cannot be a symptom of many serious illnesses, of a skin infection, or of emotional stress. The use of certain drugs may also cause temporary baldness. In male pattern baldness, heredity strongly influences the degeree of hair loss and the age at which it begins. A man can ingerit baldness from either hes father or hes mother. The exact pattern of influence is not known. The percentage of men who have male pattern baldness increaseswith age. People may use any of several methods to cover bald areas. Many wear a hairpiece, such as a toupee or a wig. Others prefer hair, wearing, a technique in which the sides of a hairpiece are served into the remaining hair. In a process called hair tranplanting, a doctor surgically, removes plugs of the scalp that contain growing hair. The plugs are then transplanted to the bald areas. In addition, clinical trials have ahown that treatment with a special drug stimulates hair growth in some individuals with baldness. This drug, which has the trade name ^Rogaine^, was approved in 1988 by the Food and Drug Administration (FDA) for treatment of baldness. It must be applied to the scalp twice daily to maintain hair growth.