Normal breast has blood flow signals and it is important to note whether the breast ultrasound reports nodules and other manifestations. Blood flow signal means that there is a blood supply to a certain tissue. As a normal tissue in the human body and with secretion function, the normal physiological activities of the mammary gland need blood supply, so normal mammary tissue has blood flow signal. What is important to note in the report is the presence or absence of a breast nodule and whether the nodule has a blood flow signal. Breast nodules can be seen in a variety of conditions such as acute mastitis, breast fibroadenoma, and breast cancer. The presence of a blood flow signal in a nodule means that the nodule may be at risk for cancer, and should be combined with other tests, such as a tissue biopsy. If you find a breast nodule with blood flow signals, it is important to seek medical attention and consult your doctor for professional treatment.