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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.
Autoimmune reactions against the thyroid can cause hyperthyroidism; Graves' disease is one such condition. The immune system malfunctions, causing an increase in thyroid hormone. Goiter, a greatly enlarged thyroid gland, is seen in those with Graves' disease and is due to the excessive secretion of thyroid hormone.utoimmune reactions against the thyroid can cause hyperthyroidism; Graves' disease is one such condition. The immune system malfunctions, causing an increase in thyroid hormone. Goiter, a greatly enlarged thyroid gland, is seen in those with Graves' disease and is due to the excessive secretion of thyroid hormone.