Thyroid cancer is a relatively common malignancy that is more common in women. The vast majority of thyroid cancers occur in young adults. Less malignant thyroid cancer can sometimes survive naturally for more than 10 years, and some can even survive with lung metastases for about 5 years, but highly malignant thyroid cancer can kill you in a short time. Thyroid cancer is mainly treated by surgery, but it can still recur. Since most patients have no conscious symptoms at the initial stage of thyroid cancer recurrence after surgery, once symptoms such as hoarseness, choking, breath-holding, dysphagia, hemoptysis or joint pain appear, it often indicates that recurrent cancer has developed to a certain extent. Most of the recurrence time after thyroid cancer surgery is within 5 years. The recurrence site is mostly at the original tumor site or neck, about 40% occurs at the original surgery site and 60% occurs at the lymph nodes in the neck. Therefore, patients with thyroid cancer should pay special attention to whether there is a palpable lump at the original surgery site or neck. After surgery, patients should go to the hospital for regular checkups. Usually every three months or six months for two years, and every six months or year thereafter. The examinations include ultrasound of the neck and abdomen, chest X-ray, isotope scan of the neck and the whole body, and blood tests. Once thyroid cancer is found to have recurred, patients should not be pessimistic and give up treatment. If the patient can actively cooperate with the doctor to get the correct and timely treatment, the patient can still have a very good effect. At the same time, patients should not blindly seek medical help because there is still a possibility of recurrence if they are not treated properly.