A high thyroid stimulating hormone (TSH) usually does not recover on its own. High TSH may be considered as primary hypothyroidism, subclinical hypothyroidism, or exogenous thyroid hormone secreting tumors, etc. It is recommended to consult a doctor for prompt treatment. In case of subclinical hypothyroidism, only elevated serum TSH level and normal FT3 and FT4 levels can be found in laboratory tests. According to the TSH level, subclinical hypothyroidism can be divided into two categories: the first category is mild subclinical hypothyroidism: TSH<10μIU/ml; the second category is severe subclinical hypothyroidism, TSH≥10μIU/ml. Thyroid hormone therapy should be given if the patient has symptoms of hypothyroidism, positive TPOAb, dyslipidemia or atherosclerotic disease. Patients with high levels of thyroid stimulating hormone need to consult an endocrinologist for treatment under medical supervision.