The thyroid gland is located in the front of the neck and produces the thyroid hormone, which controls the speed at which the body's metabolic rate or the rate at which chemical reactions function in the body.
Hypothyroidism is the most common thyroid disorder.
Hyperthyroidism means overactivity of the thyroid gland, resulting in too much thyroid hormone in the bloodstream. The oversecretion of thyroid hormones leads to overactivity of the body's metabolism.