A lump with blood flow signals usually occurs in the breast. The presence of blood flow signals in a breast lump occurs most often in women, and refers to a breast ultrasound that suggests a blood supply around the breast lump, and a Doppler that shows blood flow. Normally there is a blood supply to any part of the breast, otherwise there is no way for the tissues to become viable. In some breasts the blood supply is more obvious, some subtle blood vessels can be seen, and some can’t be seen, so the blood flow signal in the breast is not a very unique feature. If it is a malignant tumor, it will show abundant blood flow around the mass, and it can also be determined whether it is a malignant tumor based on the size and border of the mass, as well as whether there is any calcification of the mass, blood flow, and whether there is any exhaustion of the acoustic shadows behind the mass. However, one cannot rely solely on the blood flow signal inside the breast to confirm that it is a malignant tumor of the breast, and the benignity or malignancy of the mass ultimately relies on the pathology to be determined.