Hair Loss AudioHealth Library Topic 2031 Hair Loss Hair loss is a natural process that happens with aging. As people age, their hair grows more slowly and gradually gets thinner.
Hair grows from hair follicles, which are in the scalp and contain the root of the hair.
When the hair falls out, it is replaced with a new hair from the same follicle. No new follicles are formed during a person's lifetime. Permanent hair loss can happen when something interferes with the follicle. Hair loss in men is sometimes called pattern baldness. Two things that cause this type of hair loss are heredity and response of the follicle to the male hormone testosterone.