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Hashimoto's disease is an autoimmune disorder in which your immune system creates antibodies that damage your thyroid gland. Doctors don't know what causes your immune system to attack your thyroid gland. Some scientists think a virus or bacterium might trigger the response, while others believe a genetic flaw may be involved.

A combination of factors — including heredity, sex and age — may determine your likelihood of developing the disorder.

Jan. 02, 2014