Thyroid nodules 8 x 5mm are not considered large. The nature of thyroid nodules is mainly determined by ultrasound of thyroid nodules, as well as family history, history of ionizing radiation and other factors. The ultrasound findings of thyroid nodules have the following characteristics: 1) thyroid nodules grow very fast within a short period of time; 2) the growth pattern changes from horizontal to longitudinal, with the ultrasound describing a nodule with an aspect ratio of >1; 3) the borders of thyroid nodules become unclear, there is gravel-like calcification in the nodules, hardness becomes hard, blood flow signals become abundant, and the nodules adhere to the surrounding soft tissues, especially to the anterior cervical muscles in front of the thyroid gland. adhesions to the anterior cervical muscles of the thyroid gland. In addition to thyroid nodules, multiple enlarged lymph nodes in the neck, especially if they have gravelly calcifications, may be considered malignant thyroid nodules. Therefore, the size of thyroid nodules is not an indicator of the nature of thyroid nodules, but mainly based on the above indicators. If the nodule is benign, regular observation is sufficient and no surgery or medication is needed. If it is a malignant nodule, it is recommended to undergo surgery as soon as possible.