Whether thyroid cancer will spread after surgery depends on the pathological type of thyroid cancer, the form of surgery and postoperative interventions. Most of the thyroid cancers are well-differentiated papillary thyroid cancers, which are less likely to spread, even if the surrounding lymph nodes have metastasized, the chance of spread after surgery is still low. In addition, after thyroid cancer surgery, most patients will take radioactive iodine-131 and subsequent thyroid hormone supplementation, replacement and suppression therapy, depending on the situation, which can minimize the chance of spread. Therefore, whether thyroid cancer will spread after surgery is related to a number of factors, but overall, with active treatment, the chance of spread will be minimized.