If you are still able to express milk after two years of weaning, there are two cases to consider. One is the possibility of residual milk. During the weaning process, because of the closure of the milk ducts, part of the milk is not discharged from the breast in time to accumulate in the breast, and the milk is discharged later for squeezing reasons or other reasons, which may last for several years. If the color is light blue or slightly cloudy and there are no other uncomfortable symptoms, you can have a mammogram. Another condition is nipple discharge, which is unilateral or bilateral nipple discharge with no obvious cause, either clear or cloudy, and may be bloody. Mammography is recommended because nipple overflow may occur in cystic hyperplasia, ductal dilation of the breast, intramammary papilloma or even breast cancer.