After thyroid cancer surgery, you need to take Retis (or Eugenol) for life to prevent tumor recurrence. The parathyroid function and blood calcium will be checked 2 weeks after surgery and the dosage of calcium will be adjusted, and the discharge summary and pathology report will be received. The thyroid function was reviewed 2 months after surgery and the dosage of Raltez was adjusted. The thyroid gland ultrasound and thyroid function will be reviewed 6 months after surgery. Follow up at intervals of 6-12 months, preferably after the change of season. Special patients: Patients during pregnancy: 1-6 months, monthly thyroid function check. Once in 7-10 months and again 6 weeks after delivery. Patients treated with iodine 131: 2-3 days prior to discontinuation: recheck thyroid function and globulin, globulin antibodies. 2-3 days before iodine 131 treatment: recheck thyroid function and globulin, globulin antibodies.