The breast is a secretion organ, there will be a small amount of secretion through the breast duct discharge, so usually squeeze the breast water situation, no pain discomfort is considered normal, usually pay attention to good breast cleanliness and hygiene can be. The nipple area is prone to bacterial growth, the nipple has a breast duct with the internal connection, bacteria easily retrograde infection caused by inflammation of the mammary gland. This can lead to increased discharge, squeezing the nipple with discharge, most of which is accompanied by redness, swelling and pain in the mammary gland, which needs to be diagnosed by ductoscopy. Some patients with cystic hyperplasia of the breast may also have nipple overflow. It is also necessary to consider hemorrhagic overflow caused by intraductal papilloma and breast cancer, etc. When there is flowing water in the nipple, it is necessary to go to the hospital for examination and diagnosis in a timely manner, and if necessary, for symptomatic treatment.