The presence of blood flow signals in grade 3 breasts may suggest that the mass has a vigorous metabolism, grows faster, and has the potential to deteriorate, or it may be due to physiologic reasons. If the breast examination is in the physiological menstruation period, the breast is in the state of congestion and edema, the examination may also have a bleeding signal performance, there is no need to intervene, after the end of menstruation will generally return to normal. The breast grade 3 with blood flow signal is generally benign lesions, can be manifested as a round or oval-shaped lump, most of the swelling surface is smooth, clear boundaries and there is no adhesion with the skin and surrounding tissues, in the breast can be pushed; benign breast lesions are malignant lesions, from the shape of the swelling, boundaries, perimeter, hardness and so on to determine the various aspects. When there is a blood flow signal in grade 3 of the breast, after excluding physiological reasons, it is necessary to consult the doctor in time to avoid delaying the condition.