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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.
1 Hashimotoâs disease is a common cause of hypothyroidism (underactive thyroid).  Hashimotoâs disease is an autoimmune condition â immune system cells attack the thyroid gland, and the resulting inflammation and destruction of thyroid tissue reduces the thyroidâs ability to make hormones.