Hyperthyroidism (Overactive Thyroid)

Hyperthyroidism, also called overactive thyroid, is a condition where your thyroid makes and releases high levels of thyroid hormone. It has multiple possible causes. The main thyroid hormones are triiodothyronine (T3), thyroxine (T4) and thyroid stimulating hormone (TSH).

Hyperthyroidism speeds up your metabolism, which can affect several aspects of your health. The condition can throw your whole well-being off balance. You may not feel like yourself or even feel out of control of your body. It’s important to get medical treatment if you develop signs of hyperthyroidism so you can get back to feeling like yourself.

How common is hyperthyroidism?

Hyperthyroidism is relatively rare. Approximately 1.3% of people in the United States have it.