Classification of breast nodules refers to the categorization of the severity of the breast during a mammogram, which is divided into categories 0-6, with category 0 being the lowest level, and the higher the value, the higher the risk of having breast cancer. Double breast nodule category 3 means that there are breast nodules in both breasts. The risk level of breast nodules is category 3, which belongs to the intermediate level, and most of them are considered to be benign nodules, but malignant changes cannot be ruled out. If the size of the nodule is less than 1cm, it can be observed, followed up and reviewed regularly. If there is no abnormal change in the results of two consecutive years of review, the nodule can be characterized as benign. If it exceeds 1cm, and there are other abnormalities such as faster growth and abnormal pain, it is necessary to consider surgical treatment and send it to pathology for examination in order to discharge the possibility of cancer, so breast nodules of category 3 need to pay attention to the changes of the nodule at any time.