Thyroid function includes seven items, and when TT4, TT3, FT4, FT3 are elevated and TSH is decreased, we call it hyperthyroidism (TSH must be decreased to be diagnosed). For hyperthyroidism, 80%-85% is caused by Graves’ disease, and with Graves’ disease, typical symptoms of hyperthyroidism such as fear of sweating, panic and hand trembling, weight loss, etc. will occur, and thyrotropin receptor antibody (TRAb) will be elevated (TRAb is the cause of Graves’ disease), so after hyperthyroidism is detected, TRAb will be checked to clarify whether it is Graves’ disease. Therefore, after hyperthyroidism is detected, TRAb is usually checked to determine whether it is Graves’ disease. If it is Graves’ disease, the hyperthyroidism should be treated with medication, iodine 131 or surgery in a standardized manner. In addition to this, 15%-20% of hyperthyroidism is not caused by Graves’ disease, so there is no need to use antithyroid drugs in this group, or the effect of drug treatment is not good. Therefore, for people with normal TRAb but hyperthyroidism, the following tests should be completed: 1) thyroid peroxidase antibody (TPOAb) to determine if Hashimoto’s thyroiditis is present (Hashimoto’s thyroiditis does not require anti-thyroid medication); 2) thyroid ECT, if the ECT shows a decrease in thyroid function, the possibility of subthyroiditis is high (no anti-thyroid medication is needed, but other symptomatic treatment may be required). If the ECT shows that the thyroid nodule or adenoma is hyperfunctional, it is considered to be a high-functioning adenoma of the thyroid gland or a nodular toxic goiter (drug treatment is not effective, iodine 131 or surgery is needed).