Whether or not subclinical hypothyroidism can heal spontaneously should be analyzed in the context of different etiologies. For example, drug-related hypothyroidism can heal spontaneously 3-4 weeks after stopping medication, while autoimmune hypothyroidism is less likely to heal spontaneously. Subclinical hypothyroidism can be treated differently depending on the condition, and not all patients need to take medication for life. Clinical treatment is often based on thyroid function indicators. If the TSH indicator is between 4-10 mIU/L, drug treatment is not recommended and the indicator can be monitored regularly. Some patients with subclinical hypothyroidism may recover to normal or maintain stable TSH levels for life and do not affect the patient’s life. If TSH is greater than 10.0mIU/L, as well as subclinical hypothyroidism during pregnancy, levothyroxine sodium tablets should be given for replacement therapy. The diet of subclinical hypothyroidism is based on a general light diet, with moderate intake of iodine, but a high iodine diet should be avoided to avoid aggravating thyroid damage.