Hyperthyroidism, referred to as “hyperthyroidism”, is a syndrome characterized by an increase in metabolic rate and neuroexcitability due to an excess of thyroid hormones in the bloodstream. The main clinical manifestations are rapid heartbeat, fear of heat, excessive sweating, hyperphagia, weight loss, fatigue, shaking of the hands and feet, irritability, insomnia, dreaminess, increased number of stools per day, menstrual irregularities in women, and anorexia, indifference, depression, little speech and drowsiness in the elderly. There may be enlargement of the anterior neck (thyroid gland) and protruding eyes. Thyroid function tests may reveal increased levels of serum thyroid hormones (TT3, FT3, TT4, FT4), decreased TSH (thyroid stimulating hormone) and increased iodine uptake by the thyroid gland at 131. Hyperthyroidism is not a single disease, but can be caused by a variety of reasons. The most common is diffuse goiter with hyperthyroidism (also called Grave’s disease), followed by nodular goiter and functionally autonomic thyroid adenoma. There are also some other uncommon causes of hyperthyroidism, such as subacute thyroiditis, iodine hyperthyroidism, TSH-secreting pituitary tumors, choriocarcinoma or chylothorax. ovarian goiter, etc.