Some hair loss is natural. Hair follows a genetic program that includes growth, dormancy and shedding. An average of 100 hairs are lost daily but most regrow because the follicle remains. When loss exceeds growth, baldness occurs.
In most patients, hair loss is inherited from their parents. These hair loss genes make certain hair follicles sensitive to the hormone dihydrotestosterone (DHT) which inhibits follicle growth.
70% of men and 50% of women experience some sort of hair loss in a lifetime. Androgenic pattern baldness is a continuous disorder that causes men and some women, to lose hair over the front, top and crown of the head. As every hair on the head is genetically programmed before birth either to be sensitive to the Androgenic hormone DHT, or become permanent lifelong hair, not affected by the normal hormones. The Androgenic hormone appears after puberty causing these sensitive follicles to shrivel – the effect is first noticed as thinning hair which gets thinner and shorter. Eventually, the hair follicle dies and permanent baldness occurs.