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Everyone has some hair loss every day. In fact, it is normal to lose up to 100 hairs a day.
However, some people lose a lot of hair early in life because it runs in their family (inherited)
or because of disease, medications, stress, injury, or damage to the hair.
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 or female-pattern hair loss, or androgenetic alopecia.
(Alopecia is the medical term for hair loss.) About half of all people have this type of hair loss by about 50 years of age.1, 2
See an illustration of typical inherited hair loss.
Ringworm of the scalp (tinea capitis), which is common in children.
Mental stress or physical stress, such as recent surgery, illness, or high fever.
Chemotherapy, the use of medication to destroy cancer cells.
Pulling your hair back too tightly, wearing tight braids or ponytails, or using curling irons or dyes.
Age. As you age, you grow less hair. It is also thinner and tends to break more easily.
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