There are three cases of nipple suction bleeding: First, nipple injury, mainly due to sucking too much to cause acute nipple injury, the phenomenon of suction bleeding, may not be special treatment. Secondly, intraductal papilloma of breast, due to the rupture of local mucosal blood vessels of the tumor, the amount of bleeding can be increased in the process of sucking and the phenomenon of bleeding from suction can occur. Because intraductal papilloma of breast has the possibility of cancerous transformation, once diagnosed, it should be positively treated with surgery. Thirdly, breast cancer, manifested as hard and irregular painless lumps can be touched in the breast, accompanied by nipple overflow of bloody fluid, and blood water can appear when sucking. A variety of breast diseases can cause nipple suction bleeding, should be actively to the regular hospital breast ultrasound or molybdenum target examination, clear breast lesions and actively cooperate with breast surgeon treatment.