Genetics is the main reason that people lose their hair
prematurely, although certain medical conditions can also cause people to lose their
hair.
There are three types of hair loss: generalized hair
loss, patchy hair loss, and baldness in men. Generalized hair loss can be caused by
certain infections, vitamin deficiencies, thyroid gland disorders, medication usage, and
exposure to certain toxins. Patchy hair loss is caused by ringworm and alopecia areata.
Baldness in men is caused by androgens, which is a male hormone. Genetics is a major
cause of baldness and woman can inherit this as well, although usually women do not lose
all of their hair as some men do.
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