Hashimotos thyroiditis is an autoimmune disease in which the thyroid gland is gradually destroyed. Over time the thyroid may enlarge forming a painless goiter. Some people eventually develop hypothyroidism with its accompanying weight gain, feeling tired, constipation, depression, and general pains.
Diagnosis is confirmed with blood tests for TSH, T4, and antithyroid antibodies.
Hashimotos thyroiditis is treated with thyroid hormone replacement agents such as levothyroxine, triiodothyronine or desiccated thyroid extract.