Common causes of hyperthyroidism include Graves’ disease, Hashimoto’s thyroiditis, autonomous high-functioning adenomas of the thyroid gland, and pituitary tumors. Hyperthyroidism is an abnormality in the synthesis and secretion of thyroid hormones that occurs in response to a variety of factors. Common causes of hyperthyroidism include Graves’ disease, Hashimoto’s thyroiditis, thyroid hyperfunctioning adenoma, and pituitary tumors. Of these, Graves’ disease is the most common cause of hyperthyroidism and can be definitively diagnosed with a TRAb test. Symptoms of hyperthyroidism involve multiple systems, mainly including fatigue, excessive sweating, low fever, irritability and anxiety, agitation, palpitations, arrhythmia, emaciation, hyperphagia, diarrhea, progressive muscle weakness, and protruding eyes. It is recommended to seek timely medical treatment and standardize the diagnosis and treatment.