The size of a thyroid nodule is 3^2 mm, which is not serious. Thyroid nodules are very common, with a high incidence of benign nodules, occurring for reasons related to abnormal thyroxine metabolism in the body. In many patients, there are no clinical symptoms, but they can be checked regularly, with a color ultrasound of the thyroid gland every 3-6 months. It is also important to pay attention to dietary modifications and appropriate iodine-containing food supplements. For isolated thyroid nodules, if the edge is irregular, >1cm. or if there is obvious calcification, there is a possibility of malignancy, which needs to be further combined with puncture, or local excision for freezing and sent for pathological examination. If the lesion is determined to be malignant, it is very serious and requires glandular excision and lymph node dissection. After surgery, adjuvant therapy, including iodine-131 therapy, is required, and some patients require intravenous chemotherapy and monitoring of changes in nail function.