Hair Loss - Introduction
Facts about normal hair growth:
About 90 percent of hair on the scalp grows continually. The other 10 percent of scalp hair is in a resting phase that lasts two to three months. At the end of the resting stage, this hair is shed.
Shedding 50 to 100 hairs a day is normal. When a hair is shed, it is replaced by a new hair from the same follicle and the growing cycle starts again. Scalp hair grows about one-half inch a month. As people age, the rate of hair growth slows.
What causes hair loss?
Hair loss is believed to be primarily caused by a combination of the following:
- aging
- change in hormones
- illness
- family history of baldness
- burns
- trauma
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