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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.
Alopecia areata is an autoimmune condition that causes hair loss that occurs in people with autoimmune thyroid disease more often than expected by chance. Unlike the types of diffuse hair loss described above, alopecia areata causes discrete, often circular, areas of hair loss.