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Alopecia is hair loss that can be caused by heredity, aging, disease, medications or lifestyle. The timing and course of hair loss can provide clues to its cause.For example, hair loss that comes on suddenly may be attributed to illness, diet, or medical treatments, such as chemotherapy or radiation.nother cause of hair loss is a condition called cicatricial alopecia, in which the hair follicles that produce hair are destroyed. Hair loss can be experienced by people with certain types of anemia, anorexia, and thyroid disease.
There are several different causes and patterns of alopecia. Alopecia areata is one type of hair loss. In the UK, it is estimated to affect about 15 in 10,000 people. Alopecia areata can occur at any age but most cases first develop in teenagers and children. At least half of the people with alopecia areata develop their first patch of hair loss before they are 21. Males and females are equally affected. The condition tends to be milder when it first develops at an older age. The typical pattern is for one or more bald patches to appear on the scalp.