There is a possibility of hypothyroidism with low total thyroxine, but there may also be thyroid disorders such as low T4 syndrome, Hashimoto’s thyroiditis, etc. Consultation with a doctor is recommended. Hypothyroidism may be present in patients with low thyroid hormones. Common conditions include autoimmune thyroiditis such as Hashimoto’s thyroiditis, or iodine deficiency, a lack of the raw material used to synthesize thyroid hormones. Low thyroid hormones may also occur after thyroid surgery. In hypothyroidism, there is a decrease in thyroid hormone secretion, which causes slow metabolism and a series of symptoms. The lack of thyroid hormone can be supplemented under the guidance of the doctor’s medication, such as levothyroxine sodium, dry thyroxine and so on. Patients with hypothyroidism should pay attention to the monitoring of thyroid function and heart function during the medication period, and adjust the medication under the guidance of the doctor, and should not stop the medication or adjust the usage of the medication without authorization.