The causes of thyroid cancer are still unclear, but statistics show that the following groups are more likely to develop thyroid cancer: those who have had thyroid cancer in the past or have a history of thyroid cancer in their relatives; those who have had radiation exposure to the head and neck when they were children or have been exposed to radioactive dust; and women, who are more likely to develop thyroid cancer than men, with about 7 out of 10 thyroid cancer patients being women. If you have any of these high-risk factors, and you have hoarseness without throat disease, or if you have blood in your sputum, or if you have a fast-growing neck lump, or if you have difficulty swallowing, you need to be checked for the possibility of thyroid cancer. Regular ultrasound examination of thyroid gland can detect thyroid cancer problems early. Depending on the results of the test, adjust the frequency of review or further tests, such as thyroid puncture, to confirm whether it is thyroid cancer. Although cancer is scary, most thyroid cancer patients have a high long-term survival rate, especially those who are detected early. However, after cure, thyroid cancer still has the possibility of recurrence, which usually occurs decades after the initial treatment. Therefore, patients should have regular follow-up for signs of recurrence, and this regular checkup should continue throughout their lives.