Breast overflow is usually caused by ductal dilatation or intraductal papilloma. If the overflow is red in color, it is necessary to consult a doctor promptly, as this may be an early stage of breast cancer and further examination is needed. For example, ultrasound, mammogram or mammography, if a mass is found inside the duct, it needs to be treated surgically and sent for pathological examination. If the mass is benign, regular review will be required, but if it is malignant, further surgery or follow-up treatment will be required. If it is plasma, white, or colorless, or some squeeze out the kind of cheese, do not need to worry too much. If it’s only when you squeeze it, but not when you don’t squeeze it, it’s fine to review it regularly. If you’ve just been weaned, especially after 2 or 3 years, there will still be some liquid coming out when you squeeze, but it may get better over time, but you still need to pay attention to regular review, mammogram once a year, and mammogram once a year or two, this is a must.