DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Swollen thyroid gland at the base of the throat of a 51-year-old man who has Graves' disease. The thyroid is an endocrine (hormone-producing) gland at the base of the neck. It produces hormones controlling the body's metabolism. The quantities of hormones produced are normally regulated by the thyroid-stimulating hormone (TSH). When Graves' disease occurs, the patient's immune system over stimulates the thyroid gland (hyperthyroidism). Treatment involves radioactive iodine or surgical removal.
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