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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 facts. 1  Alopecia areata is a hair-loss condition which usually affects the scalp. 2  Alopecia areata causes one or more patches of hair loss. 3  Alopecia areata affects both genders. 4  It is an autoimmune disorder, in which the immune system attacks hair follicles, is believed to cause alopecia areata.lopecia areata is occasionally associated with other autoimmune conditions such as thyroid disease, vitiligo, lupus, rheumatoid arthritis, and ulcerative colitis. The diagnosis or treatment of these diseases is unlikely to affect the course of alopecia areata.