Ultrasound shows breast nodule grade 3 is a high likelihood of benign and 0-2% probability of malignancy, with blood flow signals seen in benign or malignant lesions, which are not serious overall. BI-RADS classification is based on breast ultrasound, molybdenum target and other imaging results to assess and classify the risk of malignancy of the nodule, class 3 means a high likelihood of benign, likely to be caused by breast fibroids, breast cysts and so on, and only 0 to 2% risk of being caused by breast cancer. The presence of blood flow signals may be due to malignant tumors such as breast cancer, but breast cancer can also present as bloodless, while intraductal papillomas, inflammatory lesions, and so on can also present with blood flow signals. Therefore, the presence or absence of blood flow signals does not suggest a specific diagnosis, and lesions with blood flow signals may be benign or malignant. The 3 types of breast nodules with blood flow signals are generally benign and can be improved or cured with symptomatic and surgical treatments, and there is only a small risk that they are caused by breast cancer, which is generally not serious. Patients are advised to consult their specialists, make a comprehensive judgment based on other clinical findings, and follow the doctor’s instructions for treatment.