Hypothyroidism into hyperthyroidism may be considered to be caused by hypothyroidism patients taking too large a dose of medication, if there are obvious symptoms of hyperthyroidism is generally more serious, it is recommended to consult a doctor in a timely manner, in accordance with the doctor’s instructions to take reasonable medication. Patients diagnosed with hypothyroidism need to follow the doctor’s instructions to take levothyroxine sodium tablets to control the thyroid hormone within a reasonable range, if the dose of medication is too large may cause an increase in thyroid hormone in the blood, resulting in hyperthyroidism. Therefore, patients with hypothyroidism should have regular thyroid function tests to help monitor thyroid hormone levels. Patients with hypothyroidism to hyperthyroidism who do not have obvious symptoms of hyperthyroidism such as tachycardia, weight loss, diarrhea, etc. are generally not considered serious and can recover on their own after discontinuing or decreasing the use of medication under the guidance of a doctor. Patients with hypothyroidism to hyperthyroidism should go to the hospital and ask the doctor to make a judgment, and should not make a blind judgment on their own.