If thyroid cancer spreads to the lymph, it increases the risk of metastasis and recurrence of thyroid cancer. Thyroid cancer is the most common thyroid malignancy including four pathological types: papillary, follicular, undifferentiated and medullary carcinomas, among which papillary cancer is the most common. Taking papillary thyroid cancer as an example, if lymph node metastasis occurs, the patient’s risk of recurrence needs to be evaluated according to the tumor condition and the extent of lymph node metastasis. In general, patients with more lymph node metastasis of thyroid cancer are at higher risk of recurrence and metastasis, so the surgery also requires resection of the opposite side of the body and lymph node dissection in the neck, as well as iodine 131 treatment if necessary. Thyroid cancer is more prone to lymph node metastasis, patients need to carry out standardized treatment under the guidance of doctors.