Hyperthyroidism is associated with disease factors (e.g., Graves’ disease, Hashimoto’s transient hyperthyroidism) and drug factors (e.g., levothyroxine sodium tablets). 1. Disease factors: Graves’ disease is the most common cause of hyperthyroidism, subacute thyroiditis, postpartum thyroiditis and other causes of thyroid hormone release into the bloodstream can also cause hyperthyroidism. In addition, choriocarcinoma, pituitary TSH adenoma and other diseases can also cause hyperthyroidism. 2. Drug factors: in the process of taking levothyroxine sodium tablets, if the dose of the drug is too large, it may cause medication hyperthyroidism, in addition, a large amount of iodine intake can also cause hyperthyroidism. Hyperthyroidism patients should be under the guidance of the doctor to clarify the cause and treatment.