Blood flow in the breast generally refers to the presence of blood flow signals in the breast on color ultrasound, suggesting a mass or a localized blood supply to the tissue. In general, color Doppler ultrasound can show blood flow in a woman’s breast, and if a woman is ovulating, she may have a localized blood supply. In addition, some diseases may also show blood flow signals in the breast on color ultrasound, such as breast hyperplasia, breast fibroids, and breast cancer. However, just based on the result of blood flow signal in the breast, it is not possible to judge which kind of condition is causing it, nor can it judge the benign or malignant nature of the disease, but also needs to be combined with the patient’s clinical symptoms as well as the imaging examination to make a comprehensive judgment. Patients are advised to consult a professional doctor and undergo further examination according to the doctor’s advice to clarify the cause.