The survival time of thyroid cancer after surgery is as follows: 1. Differentiated thyroid cancer: if surgery is tolerated and can be cut, the survival rate of non-high risk patients is more than 90% in 20 years. If surgery is not possible or cannot be performed, such as lung metastasis, the prognosis is usually poor and the survival time is reduced accordingly; 2. Medullary carcinoma: the five-year survival rate is higher than 70%, if surgery is possible, the survival time will be extended accordingly, if there is no chance of surgery or distant metastasis, the survival time is shorter; 3. Undifferentiated thyroid cancer: the prognosis is poor, the average survival time is 5-9 months and the five-year survival rate is extremely low.