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General Discussion. Autoimmune thyroiditis (AT), also known as Hashimoto's disease, is a chronic inflammatory disorder of the thyroid gland that is caused by abnormal blood antibodies and white blood cells that mistakenly attack and damage healthy thyroid cells.utoimmune thyroiditis (AT), also known as Hashimoto's disease, is a chronic inflammatory disorder of the thyroid gland that is caused by abnormal blood antibodies and white blood cells that mistakenly attack and damage healthy thyroid cells.
The list of types of Thyroid disorders mentioned in various sources includes: 1  Hypothyroidism. 2  Hyperthyroidism. 3  Hashimoto's thyroiditis-an autoimmune form of hypothyroidism. 4  Graves' disease-an autoimmune form of hyperthyroidism. 5  Thyroid cancer. 6  Goiter.