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Autoimmune thyroid diseases, such as autoimmune thyroiditis, which is also known as Hashimotoâs thyroiditis or chronic lymphocytic thyroiditis, are conditions in which the immune system attacks the bodyâs own thyroid gland.hile chronic autoimmune thyroid diseases are generally mild or even symptomless, they can progress to significant hypothyroidism. Seek prompt medical care for worrisome symptoms of hypothyroidism, such as depression or unexplained weight gain. 1  Previous. 2  1. 3  2. 4  3.
Common autoimmune diseases such as thyroiditis, rheumatoid arthritis and diabetes affect more than 1 in 100 people. In contrast, a rare autoimmune disease such as Goodpastureâs disease (a form of vasculitis) affects around 1 in a million people.he causes of autoimmune diseases are not yet known. However, in many cases it appears that there is some inherited tendency to develop autoimmune diseases. In people with this inherited tendency, other factors such as infections and some drugs may play a role in triggering autoimmune disease.