The thyroid gland produces two thyroid hormones, triiodothyronine (T3) and thyroxine (T4), and releases them as needed by the body. The hypothalamus and the pituitary gland help control the thyroid gland. The hypothalamus produces thyrotropin-releasing hormone (TRH), which stimulates the pituitary gland to release thyroid-stimulating hormone (TSH). A low level of T3 tells the hypothalamus to release more TRH, and it tells the pituitary to release more TSH. The thyroid gland releases T3 and T4 until the body is receiving the required amount.
Current as ofNovember 6, 2018
Author: Healthwise Staff Kathleen Romito, MD - Family Medicine Brian O'Brien, MD, FRCPC - Internal Medicine Matthew I. Kim, MD - Endocrinology, Diabetes and Metabolism Adam Husney, MD - Family Medicine
Medical Review:Kathleen Romito, MD - Family Medicine & Brian O'Brien, MD, FRCPC - Internal Medicine & Matthew I. Kim, MD - Endocrinology, Diabetes and Metabolism & Adam Husney, MD - Family Medicine