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When the immune system mistakenly attacks a normal part of the body, this is known as autoimmunity.

Autoimmunity that causes hypOthyroidism (low thyroid) is called Hashimoto's Thyroiditis. This condition can also cause hypERthyroidism as well. There are specific antibodies in patients with Hashimoto's.

Autoimmunity that causes hypERthyroidism is usually a condition known as Graves' Disease. There are specific antibodies in patients with Graves' Disease.

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