The probability of malignancy in thyroid nodules class 4A is 2%-5%, and the probability of benign is as high as about 85%. Thyroid nodules are a common type of thyroid disease and one of the most common clinical conditions, usually divided into benign and malignant. If a thyroid nodule is detected in a category A patient and the nodule is under 0.5cm, it is recommended to review it once in 3-6 months. If the thyroid nodule grows rapidly and causes pressure symptoms in the body, such as hoarseness, sore throat, difficulty in swallowing, difficulty in breathing, etc., you should be alerted and go to the hospital in time to have a thyroid puncture to determine whether it is benign or malignant. If the thyroid gland is benign, medication should be taken promptly; if it is malignant, reasonable surgical treatment should be performed under the guidance of a doctor, and during the treatment period, attention should be paid to the diet to reduce the intake of foods high in iodine.