Thyroid stimulating hormone is a sensitive indicator of thyroid function, and there are two types of thyroid stimulating hormone elevations. In one case, elevated thyroid hormone levels are accompanied by reduced levels of free thyroid hormone and free triiodothyronine, which can be clinically diagnosed as primary hypothyroidism and requires oral replacement therapy with euthyroid. In the other case, thyroid hormone is elevated, but free thyroid hormone and free triiodothyronine levels are normal, which is clinically diagnosed as subclinical hypothyroidism. If the thyroid hormone level does not exceed 10 mol/L, clinical intervention is not required, but if it exceeds 10 mol/L, oral replacement therapy with Eugenol is also required. Generally, thyroid function will be reviewed once every four weeks after taking the medication, and the oral dose of Eugenol will be adjusted according to the thyroid function results.