TSH is thyrotropin, which is actually specified in the 2012 guidelines for the treatment of thyroid nodules and differentiated thyroid cancer developed by Chinese medical experts. With low thyroid function and compensatory elevation of TSH after thyroid cancer surgery, post-operative thyroid cancer patients should take eugenol for a long time. Firstly, the thyroid gland is partially removed after thyroid cancer surgery and the level of thyroxine is not enough, so it is necessary to take the drug to supplement part of the hormone; secondly, taking Eugenol can lower TSH, and a low TSH can control the recurrence of thyroid cancer. The dose of oral Eugenol is chosen according to the risk level, and the specific target of TSH suppression needs to be determined by an endocrinologist.