Currently, there is no accepted standard of cure for thyroid cancer in the medical community. Generally speaking, thyroid cancer is considered clinically cured if there is no recurrence within five years after treatment. Early diagnosis and treatment of thyroid cancer can effectively control the disease. Within five years after treatment, if there is no metastasis or recurrence, the patient is clinically cured. However, it should be noted that some data show that about 30% of patients with undifferentiated thyroid cancer will develop recurrence or metastasis after surgery, with 2/3 of them occurring within 10 years after surgery. Therefore, thyroid cancer patients must strictly follow the doctor’s prescription to take medication on time and in the right amount, and insist on regular review of thyroid function and neck ultrasound to monitor the recurrence and metastasis of the tumor. In addition, thyroid cancer patients should also pay attention to rest, healthy diet, proper exercise and avoid radiation exposure after treatment. If nodules or lumps are found in the thyroid gland or other parts of the body, it is important to seek medical attention promptly.