When the thyroid gland grows a tumor, it may be a benign cyst, thyroid nodule or thyroid cancer. Generally speaking, thyroid cancer has no obvious symptoms, and most of them are neck masses. Or hoarseness, dysphagia and dyspnea due to excessive tumor compression for no reason. If a mass is found by palpation and thyroid ultrasound, fine needle aspiration will be performed first. Under the guidance of thyroid ultrasound, a small number of cells will be extracted by fine needle, and whether there are cancer cells will be examined under the microscope by cytological staining. This test has high accuracy, but false negative results will still appear. The most correct diagnosis is the surgical tissue diagnosed by a pathologist. Whether it is cancer or not is confirmed during operation. When thyroid disease needs surgical treatment, it is carried out under general anesthesia. If thyroid cancer is suspected, intraoperative frozen section examination will be performed. Once the cancer is diagnosed, the doctor will judge whether to perform neck lymph node dissection, but some thyroid cancers can not be judged by freezing test, and can only be diagnosed by postoperative pathological report. Ultrasonic scalpel reduces pain and bleeding. Traditional thyroid surgery uses frequent suture to stop bleeding. At present, there are ultrasonic scalpels, which can stop bleeding when cutting tissues through ultrasonic vibration, which can reduce the use of electrotome in traditional surgery, reduce pain and bleeding, and shorten the operation time. Ultrasonic scalpel is performed at a relatively low temperature, which has little damage to tissues and nerves. A small number of patients with permanent vocal cord paralysis will have hoarseness and numbness of hands and feet, mainly vocal cord dysfunction and parathyroid dysfunction caused by recurrent laryngeal nerve, which will generally recover within two weeks after operation. However, a few patients will still have permanent vocal cord paralysis. At present, the self-funded recurrent laryngeal nerve detection system can be used in surgery to reduce the injury of recurrent laryngeal nerve and the occurrence of permanent vocal cord paralysis. Excessive or insufficient iodine intake is not good for preventing goiter. Since 1956, China has fully implemented the policy of iodizing salt, so most of the salt now contains iodine, but recently, many people choose refined imported salt such as rock salt, rose salt and natural salt to pursue food, or choose low sodium salt to control blood pressure. This salt does not necessarily contain iodine. Therefore, iodine should be supplemented by other foods such as kelp, seaweed, cabbage, cauliflower and seafood. However, excessive iodine intake may also cause hyperthyroidism, so it is not good to eat too much or not, so it is necessary to choose carefully and take a balanced diet as the best policy. (Article source: Niu, the tumor case manager of the Community Nursing Group of Guotai General Hospital, and Cai, the attending physician of the Center of Guotai General Hospital) Subscribe to the healthy Aloha audio-visual channel to read health knowledge more easily and pay attention to health every day! Line @ ID: @:/cancer/article/29697/Be careful that thyroid cancer has no obvious symptoms Key words: thyroid cancer, ultrasonic scalpel, permanent vocal cord paralysis, iodine, goiter, Guotai General Hospital.