Subclinical hypothyroidism refers to early hypothyroidism, which means that the patient has no obvious clinical symptoms. Generally speaking, according to the onset of the disease, hypothyroidism can be divided into two different types, namely clinical hypothyroidism and subclinical hypothyroidism, of which the latter refers to the early stage of hypothyroidism, which means that the patient does not have any clinically obvious symptoms, and the diagnosis can be confirmed through the examination of thyroid function. Usually, when the test is performed, the patient’s thyroid hormones will basically remain within normal values, and only the level of thyrotropin will be elevated. Although this type of hypothyroidism is only mild, if care is not strengthened, it may subsequently develop into clinical hypothyroidism and cause generalized weakness and memory loss. Therefore, for patients with subclinical hypothyroidism, it is important to monitor thyroid function and have regular hospital follow-ups.