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There is a growing (anagen) phase, which lasts from 2 to 6 years, a resting (catagen) phase which lasts for about 3 months, and finally the shedding of the hair (telogen) phase which allows the follicle to begin pushing a new hair to the surface. DHT appears to make the follicles go into their "resting" phase faster which in turn starts to cause the hairs produced by those follicles to become thinner and thinner with each growth cycle. Female pattern baldness usually begins about age 30, becomes noticeable around age 40, and may be even more noticeable after menopause. By far the most common form of hair loss in women is due to hormone changes.
Other causes include nervous tension, side-effects of certain medications, harsh commercial shampoos, perms, hair color, bleach, blow-drying, and improper combing/brushing. Most doctors agree that if you have a oily scalp with thinning hair, frequent shampooing is advised.
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