The best way to prevent thyroid cancer does not exist in the clinic. Thyroid cancer can be prevented by regular medical checkups, staying away from ionizing radiation and improving the immune system. 1. Regular health checkups: many thyroid cancers without any symptoms can be detected through health checkups, and it is recommended to have at least one health checkup every year for effective prevention of thyroid cancer. If there are high risk factors, the frequency of monitoring should be strengthened. For example, if patients with thyroid nodule disease do not need surgery for the time being, they can follow the doctor’s instructions for regular review. 2. Stay away from ionizing radiation: minimize exposure to radiation and radiations, long-term exposure to such environment will easily stimulate the proliferation of thyroid epithelial cells and even cancer. 3. Enhance the immune system: Adopt good dietary habits and avoid eating foods with high iodine content for a long time. Maintain a calm mind, and insist on appropriate exercises every day, such as cycling, jogging, swimming and other sports, to help improve the ability to resist diseases. Regular thyroid-related checkups are recommended, and timely consultation and treatment should be sought if any suspicious conditions are found.