Thyroid ultrasound to determine the nature of the nodule, the first according to the ultrasonographer to do the nodule grading, can be divided into 5 grades. 1 grade for the normal gland, no nodule; 2 grade is basically determined to be benign; 3 grade although there is a certain risk of malignant changes, but the risk of malignancy <2%, you can continue to conservatively observe; 4 grades of nodules, if the grade is 4a, it is recommended that the left fine-needle puncture biopsy, pathology testing; if it is grade 4b, 4c or grade 5, all have surgical indications. Attention should also be paid to the morphology of the nodule itself, whether it has the morphology of a malignant tumor, including poorly defined borders, adherence, abundant blood signals, and so on. Ultrasound is only suitable for nodules with a diameter of 1.5mm or more, smaller nodules cannot be seen, so it is important to follow the doctor's instructions and have them checked every year or every 6 months, etc. If you want to get a true diagnosis, you can do it every year or every 6 months. For a truly definitive diagnosis, fine needle, cytologic puncture can be used for pathologic examination. The nature of the thyroid nodule should also be determined by taking into account the patient's medical history, family history, family history of malignant thyroid tumors, or history of radiation therapy to the head and neck.