What Is It?
Hyperthyroidism is a condition in which your body makes too much thyroid hormone. It is also called overactive thyroid.
Thyroid hormones are made by the thyroid gland. The thyroid gland is located in the lower front of the neck.
Thyroid hormones regulate the body's energy. When levels of thyroid hormones are unusually high, the body burns energy faster and many vital functions speed up.