Hair Loss (cont.)
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Excessive hair loss (more than 100 hairs a day) can be caused by inherited factors, disease, stress, medicines, injury, aging, or hair care.
Inherited hair loss
The most common cause of hair loss is genetics—you inherit the tendency to lose hair from either or both of your parents. This is called male-pattern hair loss or female-pattern hair loss. The medical term for this type of hair loss is androgenetic alopecia.
In this type of hair loss, your genes affect how your hair grows. They trigger a sensitivity to a class of hormones called androgens, including testosterone, which causes hair follicles (which hair grows from) to shrink. Shrinking follicles produce thinner hair and eventually none at all. Men generally develop bald spots on the forehead area or on the top of the head, while women often have thinning of the hair on the top of the head. About half of all people have inherited hair loss by about 50 years of age.
Other causes of hair loss
Common causes of hair loss include:
Other causes of hair loss include:
Hair loss can be categorized by types. Different types of hair loss may have different causes. For example, one type of hair loss known as telogen effluvium is caused by stress and side effects of medicines. Another hair loss type, traction alopecia, is caused by hair care.
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