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The thyroid gland uses iodine from food to make two thyroid hormones: triiodothyronine (T3) and thyroxine (T4). It also stores these thyroid hormones and releases them as they are needed. The hypothalamus and the pituitary gland, which are located in the brain, help control the thyroid gland. The hypothalamus releases thyrotropin-releasing hormone (TRH), which stimulates the pituitary gland to release thyroid-stimulating hormone (TSH). When the hypothalamus and pituitary are working normally, they sense when:
Disease or tumors of the pituitary gland can affect this process.
See a picture of thyroid hormone production.
Thyroid hormones affect every cell and all the organs of the body. They:
|Primary Medical Reviewer||Kathleen Romito, MD - Family Medicine|
|Specialist Medical Reviewer||Matthew I. Kim, MD - Endocrinology|
|Last Revised||August 7, 2012|
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