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The thyroid is a small, butterfly-shaped gland located at the base of your neck. It is one of many glands in the endocrine system in the body that regulate the function, growth and development of virtually every cell, tissue and organ in the body. Endocrine glands secrete hormones directly into the bloodstream.
The thyroid uses iodine, a mineral found in some foods and in iodized salt, to make its hormones. The two most important thyroid hormones are thyroxine (T4) and triiodothyronine (T3). Thyroid stimulating hormone (TSH), which is produced by the pituitary gland, acts to stimulate hormone production by the thyroid gland. The thyroid gland also makes the hormone calcitonin, which is involved in calcium metabolism and stimulating bone cells to add calcium to bone.