Thyroid malignant tumor is still relatively serious, but the severity of different thyroid cancer types also varies. There is no cure for malignant tumors and they are relatively serious diseases, but the severity of different types of malignant tumors varies in terms of patient prognosis. Thyroid malignant tumors can be classified into papillary carcinoma, follicular carcinoma, medullary carcinoma, and undifferentiated carcinoma according to their pathology. Among them, papillary carcinoma is the least malignant and has the best prognosis with a longer survival time; undifferentiated carcinoma is the most malignant and has the worst prognosis with a lower one-year survival rate. Follicular carcinoma and medullary carcinoma are moderately malignant and have a worse prognosis than papillary carcinoma and a better prognosis than undifferentiated carcinoma. Patients with thyroid malignant tumors need to go to regular hospitals for standardized treatment in time to prolong the survival time.