Many people go to the hospital and worry that they have thyroid cancer when they unintentionally feel or find a thyroid nodule during a health checkup. In fact, thyroid nodules are very common, especially the ultrasound reveals that 20% to 60% of people have thyroid nodules. Most of them are benign nodules and only about 6% of them are malignant nodules, but children or elderly people should be more alert to the possibility of malignancy. There are many reasons for thyroid nodules, which may be related to genetics, mental stress, endocrine disorders, abnormal iodine uptake and other factors. Once thyroid nodules are found, the first step is to go to an endocrinology clinic to find out the cause and nature of the nodules, which is the key to choosing a treatment method! Selective examination of thyroid function, ultrasound, CT, nuclear scan or cytological puncture should be performed. For hyperthyroidism, oral anti-thyroid medication or radioactive iodine therapy, and for hypothyroidism, thyroid hormone therapy; for those with normal thyroid function and small nodules, treatment may be withheld and reviewed regularly. Large nodules with symptoms of pressure should be surgically removed, and cystic or cystic solid nodules can also be treated with sclerotherapy (PEI), and those suspected of malignancy should be operated as soon as possible.