Alopecia

It means diffuse hair loss, most notably of the scalp, caused by administration of various drugs. An individual human hair goes through three stages. It grows vigorously for two to four years then enters a short transitional stage and then a resting phase lasting two to four months. Then it enters its third stage, shedding. The average head contains around 100,000 hairs. Of these up to 100 (about one out of every 1000) shed each day. After shedding, the vigorous growth stages are entered again. Pattern loss is the most common cause of hear loss and affects 70% of men and 15% of women. Classic "male" pattern baldness affects the temporal regions of the forehead and is usually accompanied by diffuse thinning in which, after shedding, a percentage of hairs do not regrow.

One of the causes of "alopecia," or hair loss, is the progressive increase of a hormone called DHT or dihydrotestosterone. As people age, especially men, the enzyme which converts testosterone to DHT increases in activity and greater concentrations of DHT are produced. Today there are blocking agents which can be prescribed which remove this cause of hair loss.

Decreasing circulation to organs is a problem throughout the body as we age and accounts for many of the manifestations of aging. The blood supply to hair follicles is not different.

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