TSH-secreting pituitary adenomas are benign tumoursof the pituitary gland. They produce too much thyroid stimulating hormone (TSH) which causes the thyroid gland to enlarge and produce thyroid hormone in excess, leading to an overactive thyroid (hyperthyroidism). Patients typically present with signs and symptoms of hyperthyroidism, but these patients may also have headaches and loss of some of their field of vision; rarely, there are no symptoms (asymptomatic). Early diagnosis and correct treatment may prevent pituitary and heart complications and may improve cure rate.