The breast is a secretion organ, under normal circumstances sometimes there is a small amount of white discharge, no other discomfort is normal, so a small amount of discharge from the breast is a normal situation. If there is a lot of discharge from the breast, it belongs to nipple overflow, which is more common due to inflammation of the breast and requires a ductoscopy. The overflow is mostly white or yellow. Since the nipple is the location of the opening of the breast ducts, bacteria can easily invade through the nipple and form inflammation in the breast ducts, and can be treated by lavage of the breast ducts after diagnosis. If the nipple overflow is bloody or brown, it is also necessary to consider intraductal papilloma, as the thin wall of the tumor can easily rupture and lead to bleeding and brown nipple overflow. Bloody overflow also needs to be considered in the case of breast cancer, which is due to the rapid growth of blood-rich breast cancer and bleeding caused by the rupture of the tumor. In the case of breast discharge, try to visit the hospital to check the nature of the discharge.