"If you get milk coming out from many ducts after you stimulate your breasts, you shouldn't worry-most probably, it doesn't mean breast cancer. If you're not pregnant or breast-feeding, but milk continues to come out, then see your doctor.
If the fluid is not milk, but comes from 1 duct and is bloody, yellow or clear, then see your doctor at once. It may be a sign of breast cancer.".
Attribution: Avallain