Working less (Under active thyroid, Hypothyroid) The normal function of the thyroid gland is to give thyroid hormone; if it gives less it is called Hypothyroidism. See details later. Working more (Overactive thyroid, Hyperthyroid) In the same way if thyroid gland gives more thyroid hormone is called Hyperthyroidism or thyrotoxicosis. See details later. Goitre An […]