("Hyper" means "over" in Greek). The thyroid hormones regulate many aspects of our metabolism, eventually affecting how many calories we burn, how warm we feel, and how much we weigh.

Role of thyroid gland in the body:
Thyroid hormones are produced by the thyroid gland. This gland is located in the lower part of the neck, below the Adam’s apple. The gland wraps around the windpipe (trachea) and has a shape that is similar to a butterfly formed by two wings (lobes) and attached by a middle part (isthmus). These hormones also have direct effects on most organs, including the heart. Hyperthyroidism is a condition in which there is an excessive amount of thyroid hormones circulating in the blood because of an overactive thyroid gland. In healthy people, the thyroid makes just the right amounts of two hormones, T4 and T3, which have important actions throughout the body. These hormones regulate many aspects of our metabolism, eventually affecting how many calories we burn, how warm we feel, and how much we weigh. In short, the thyroid "runs" our metabolism. These hormones also have direct effects on most organs, including the heart which beats faster and harder under the influence of thyroid hormones.