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This refers to the surplus production of a hormone (thyroxine) by the butterfly-shaped gland in the neck (thyroid). Hyperthyroidism is a condition in which an overactive thyroid gland is producing an excessive amount of thyroid hormones that circulate in the blood. (“Hyper” means “over” in Greek). Thyroid hormones include thyroxine (T4) and triiodothyronine (T3). T3 is actually the most active thyroid hormone. Much of the T4 is converted to T3 in the bloodstream. Hyperthyroidism can increase metabolism and as such, it is also called the OVERACTIVE THYROID. Normally, the rate of thyroid hormone production is controlled by the brain from the pituitary gland, which is in turn regulated by the hypothalamus. 

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