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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.
Hashimoto's disease, or Hashimoto's thyroiditis, is the leading cause of hypothyroidism. In hypothyroidism, an autoimmune disease, the immune system literally attacks the thyroid gland, causing it to grow and to decrease its production of thyroid hormone.ashimoto's disease, or Hashimoto's thyroiditis, is the leading cause of hypothyroidism. In hypothyroidism, an autoimmune disease, the immune system literally attacks the thyroid gland, causing it to grow and to decrease its production of thyroid hormone.