Thyroid cancer patients may not eat eugenol after surgery and before blood test, or may eat eugenol, which is divided into two cases, as follows: First, can’t eat eugenol: after surgery for thyroid cancer, the follow-up radioactive iodine-131 treatment is needed to clear the nails and the foci, which can’t be eaten eugenol, and needs to be discontinued for a period of time, and the prohibited time is around one month, in order to avoid the effect of eugenol on the radioactive iodine In order to avoid the influence of eugenol on the absorption of radioactive iodine. Second, you can take Eucerin: after thyroid cancer surgery, the treatment of radioactive iodine-131 has been completed, or there is no need for radioactive iodine-131 treatment, the purpose of taking Eucerin at this time is to provide TSH inhibition treatment, prevent recurrence, supplement and substitute to correct the state of hypothyroidism. Eugenol can be taken before blood tests, and the thyroid function will not produce major changes in the short term. After surgery for thyroid cancer, it is not always possible to take Euthyrox before a blood test, and this is determined on a case-by-case basis.