It is not easy to determine whether a patient can live for 30 years after total resection of thyroid cancer, because the prognosis of thyroid cancer of different pathologic types is different. Whether or not distant metastasis occurs in the cancer foci is also an important factor affecting the prognosis of patients. Thyroid cancer can be categorized into four types according to pathological types, mainly including papillary thyroid cancer, follicular thyroid cancer, medullary thyroid cancer and undifferentiated thyroid cancer. 1. Papillary thyroid carcinoma is the most common type, which is most common in women aged 30-45. This type of thyroid cancer is well differentiated, with low malignancy and better prognosis than other types of thyroid cancer. 2. Follicular carcinoma is most common in middle-aged people around 50 years old. This type of tumor grows faster, is moderately malignant and can be metastasized to other parts or organs through blood. 3. Medullary carcinoma of thyroid has endocrine function and can secrete calcitonin, with moderate malignancy. The median survival period is about 10 years. 4. Undifferentiated carcinoma of thyroid occurs in the elderly, with rapid development and high malignant degree, and can have cervical lymph node metastasis at early stage, and can also invade adjacent tissues or organs such as trachea, esophagus, laryngeal reentry nerve, etc. The prognosis of this type of thyroid cancer is generally very poor, and the patients have a short survival time. In addition, patients whose cancer foci are confined to the thyroid gland and have no distant metastasis generally have a better prognosis after surgery, while patients whose cancer foci have metastasized to other organs generally have a poorer prognosis even if the thyroid gland is removed surgically. Thyroid cancer must be treated without delay. Surgery is the main treatment for this disease, and patients who meet the indications for surgery should undergo surgery as early as possible. Patients who miss the chance of surgery can do radiotherapy or iodine 131 radionuclide treatment.