Most thyroid cancers are less malignant and grow slowly, and patients can live for several years without any symptoms. Most patients are diagnosed when they unintentionally find a lump in front of the neck or swollen lymph nodes in the neck and go to the hospital; some patients are diagnosed as benign thyroid tumor before surgery, but after surgery, thyroid cancer is confirmed by pathological examination. The lymph node metastasis in the neck of thyroid cancer reaches more than 60%, and distant blood metastasis is about 10%. 2.The scope of surgery determines the recurrence rate Because radiation or chemotherapy is not effective for most of thyroid cancer, so thyroid cancer is still mainly treated by surgery. Whether thyroid cancer metastasizes or recurs after surgery is obviously related to the extent of surgical resection. According to statistics, the recurrence rate is 40% to 60% after simple tumor resection and 10% to 20% after resection of the tumor and the thyroid lobe on the affected side. In addition, the degree of malignancy of thyroid cancer also determines the recurrence rate, that is, the higher the degree of malignancy, the higher the possibility of recurrence or distant metastasis after surgery. In addition, recurrence and metastasis are also related to the correct choice of the first treatment plan. If the surgical plan is properly formulated and selected, the general 10-year survival rate is more than 90%. Once thyroid cancer is found to be recurrent, patients should not be pessimistic and give up treatment. If the patient can actively cooperate with the doctor to get the correct and timely treatment, the patient will still have good results. At the same time, patients should not blindly seek medical help because there is still a possibility of recurrence if they are not treated properly. Moreover, as the number of recurrence increases, not only the treatment difficulty increases, but also the malignant degree of cancer will increase. At present, the treatment of recurrent cancer is still mainly based on surgical treatment.