After thyroid cancer surgery, according to the pathological classification, patients with papillary and follicular forms usually have to undergo iodine 131 treatment. Iodine 131 treatment is a kind of radiation therapy, which removes the residual thyroid tissue and cancer cells, but also has certain radiation to other organs of the body, that is why some patients experience nausea, vomiting, abdominal distension, constipation, discomfort in the liver area, easy to catch cold after 131 iodine treatment. This is why some patients experience nausea, vomiting, bloating, constipation, discomfort in the liver area, easy to catch a cold, etc. In order for the body to tolerate these side effects, patients usually need to be helped with some immunity boosting drugs before treatment. One month after iodine 131 treatment, patients are told to review their blood work, liver and kidney function and electrolytes for the same purpose, so that any problems can be dealt with promptly. Patients also need to have their nail function checked again to adjust the dosage of thyroxine tablets according to the results of nail function; to check parathyroid hormone to see if parathyroid function has been restored; and to check thyroglobulin to assess the effect of iodine 131 treatment. After 2-3 times of iodine 131 treatment, the residual thyroid gland and cancer cells are cleared, the patient needs to take long-term replacement therapy with Eugenol, and the thyroid function needs to be reviewed regularly during the treatment period (once a month at the beginning of the medication adjustment, and once every 3 months in the later period) to monitor whether the dosage of thyroxine tablets is appropriate. Regular thyroglobulin monitoring (once every 3 months) and annual iodine 131 whole body imaging (stopping thyroxine tablets and taking non-iodized salt for 1 week before the review) are used to evaluate for recurrence and metastasis.