The diagnosis of papillary thyroid cancer is confirmed mainly by the doctor’s examination of symptoms, such as discomfort in swallowing or hoarseness in my voice. The second is that the doctor’s examination is mainly through the hand to feel, usually to find a specialist who will feel more clearly and may suspect a lump. In this case, we usually recommend that the patient have an ultrasound. Ultrasound provides a good assessment of the thyroid nodule, including, in a more specialized way, whether the nodule has calcified foci, whether it has blood flow signals, whether the edges are clear, and how much the aspect ratio is, especially in the case of small calcified foci. There is also a very important follow-up process to see if the mass has grown. Therefore, the doctor will give a good judgment through these aspects. If it may be a thyroid cancer, in this case, the patient will be advised to undergo a cytological aspiration, but so far aspiration is the best and the easiest way to diagnose thyroid cancer before surgery, and the accuracy rate is also particularly high. Of course, there is another way to diagnose thyroid cancer is through intraoperative quick examination, and there are some patients who are difficult to diagnose during surgery but can be diagnosed after surgery by routine examination. Therefore, in general, thyroid cancer can be diagnosed through pre-surgical examination, pre-treatment examination or examination during or after surgery.