A thyroid ultrasound is used to determine the nature of the nodule, based primarily on the ultrasonographer’s grading of the nodule, which can be categorized into 4 grades. If the report is grade 1, 2 or 3, it means that the nodule is likely to be benign, and grade 1 and 2 are basically certain to be benign. grade 3 carries some risk of malignancy, but can be kept under conservative observation. If the thyroid nodule ultrasound report, the nodule is a grade 4 nodule. Either grade 4a, or 4b or 4c, is an indication for surgery. Attention also needs to be paid to the morphology of the nodule itself and whether it has the morphology of a malignant tumor, including poorly defined borders, adhesions, abundant blood signals, etc. Ultrasonography is only suitable for nodules with a diameter of 2mm or more, smaller nodules cannot be seen, so you should follow your doctor’s instructions and have them reviewed every year or every 6 months, etc. 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.