Eugenol that is levothyroxine sodium tablets, after thyroid cancer surgery is recommended to stop levothyroxine sodium tablets for 1 month and then do iodine 131. After thyroid cancer surgery to remove the thyroid gland due to the absence of thyroid function, need to take levothyroxine sodium tablets as a replacement therapy, take levothyroxine sodium tablets 1 month after stopping the drug, stopping the drug for 1 month so that the thyroid hormone reaches at least 30mIU/L, at the same time, during the period of 1 month to prohibit iodine, such as not using iodine agents, do not eat seafood, etc., and then do the iodine 131 treatment. When normal thyroid tissue exists, it is difficult for iodine to act directly on the cancerous tissue because it has a higher iodine uptake capacity than the cancerous tissue, so the cancerous tissue basically does not take up iodine. When the normal thyroid tissue is basically removed by total thyroidectomy and iodine 131 radiation therapy is given at this time, there is basically no iodine uptake by the normal thyroid tissue, and iodine 131 is basically taken up by the thyroid cancer tissue, so as to achieve the therapeutic purpose. If you feel uncomfortable after thyroid cancer surgery, it is recommended that you consult a doctor in time and standardize the treatment under the guidance of a professional doctor, so as to avoid delaying your condition.