The prognosis of different types of thyroid tumors is different, so the survival time is also different. First of all, among benign thyroid tumors, thyroid adenoma accounts for about 50% of neck lumps, nodular goiter, thyroglossal cyst, and subacute thyroiditis. If there is no predisposition to malignancy and reasonable treatment is given, most have a good prognosis and a long survival time. However, the most common malignant tumor of the thyroid gland is thyroid cancer, which includes four pathological classifications. The first type is papillary carcinoma, which accounts for 70% of all thyroid cancers and is most common in women between the ages of 21 and 40. This type is better differentiated and can be interpreted as less malignant, and its prognosis is better and it can survive for a long time. The second type is follicular carcinoma, which is mostly seen in women around 50 years old and is moderately malignant, so its prognosis is not as good as papillary carcinoma and it can survive for a long time. The third type is undifferentiated carcinoma mostly seen in the elderly, which is highly malignant and has a very poor prognosis, with an average survival of 3-6 months. The last type is the less common medullary carcinoma with moderate malignancy, so the prognosis is also average with a short survival time. Therefore, 95% of patients with well-differentiated thyroid cancer can survive for a longer time, while undifferentiated cancer has the worst prognosis and patients often die within six months. Of course, the survival period still varies greatly among individuals and cannot be generalized.