Hashimoto's thyroiditis, also known as chronic thyroiditis, is a long-lasting inflammation of the thyroid gland. This disease affects women much more often than men, with about 20 to 30 women affected for every one man. It usually develops in people over 25 years old, especially those between 30 and 40 years old. It's very rare in babies and young children. The exact cause of Hashimoto's thyroiditis is unknown, but it is an autoimmune disorder...