Thyroid nodules are assessed under ultrasound with a grading system, and if rated at level three or higher, they tend to be more likely to be malignant. The most common malignancy in thyroid nodules is thyroid cancer. Among all types of tumors, thyroid cancer tends to grow slowly and is relatively less malignant. Therefore, if an ultrasound suggests a high likelihood of malignancy in a thyroid nodule, further examinations should be conducted. This can include a fine needle aspiration biopsy, thyroid contrast-enhanced ultrasound, or even direct surgical removal of the malignant nodule for further pathological examination to determine whether it is benign or malignant. Since the degree of malignancy of thyroid nodules is relatively low compared to other malignant tumors, a high grading score on a thyroid nodule should not be overly worrying. It is advisable to proceed with formal medical checks and regular follow-ups, as the five-year survival rate is quite high, exceeding 80%.