Subclinical hyperthyroidism can be caused by medication, in which case it can usually be cured; subclinical hyperthyroidism can also be caused by diseases of the thyroid gland itself, in which case it can be cured, or it can be transformed into hyperthyroidism. It is recommended that patients with symptoms should seek medical attention. Subclinical hyperthyroidism can be caused by medication, or by a disease of the thyroid gland itself. For example, patients with hypothyroidism need to take levothyroxine hormone treatment, if the therapeutic dose is too large may appear subclinical hyperthyroidism, at this time after stopping the drug can be restored. Therefore, drug factors caused by the general can be cured. Subclinical hyperthyroidism is also caused by diseases of the thyroid gland itself, such as thyroid adenoma, Graves’ disease, etc. In such cases, some patients with subclinical hyperthyroidism may be cured after effective treatment, but some of them may develop clinical hyperthyroidism. Patients diagnosed with subclinical hyperthyroidism should actively cooperate with the doctor for treatment, and maintain a healthy lifestyle and diet, all of which will help the recovery of the disease.