Thyroid nodules category 3 are usually benign, and generally benign nodules are not significantly harmful, but there is about a 2% chance of malignancy in category 3 thyroid nodules. If the size of the nodule is large, it may cause hoarseness, difficulty in breathing and swallowing, and if it is malignant, metastasis may occur, etc. Thyroid nodule classification is now commonly used as the Thyroid TI-RADS (Ultrasound Imaging and Data Reporting System) classification, which is divided into 6 categories, with the higher the grade, the greater the likelihood of malignancy. Thyroid category 3 nodules generally do not cause discomfort. If the size of category 3 nodules is large, the nodules may cause hoarseness, dysphagia, dyspnea, etc., due to compression of the surrounding tissues, and if malignant changes occur, multiple metastases of the tumor may occur if timely intervention is not made. Once found out the thyroid nodule category 3 should be 3-6 months regular recheck thyroid ultrasound, if found that the thyroid nodule short period of time grows too fast or appear irregular shape, need to take the thyroid nodule fine needle aspiration cytology or surgery to further clarify the benign and malignant. Thyroid nodules category 3 should be promptly to the hospital, under the guidance of the doctor timely treatment, so as not to delay the condition.