Hashimoto's disease is a condition in which your immune system attacks your thyroid, which causes inflammation. This leads to an under-active thyroid gland (hypothyroidism). Your thyroid gland is a small butterfly-shaped gland at the base of your neck below your Adam's apple. It produces hormones that control many of your body’s functions, such as metabolism, your cardiovascular system, and your digestion, and is part of your endocrine system. Below you may find medications used to treat or help with Hashimoto's Disease. More about Hashimoto's disease