Because of breast cancer, the unexplained relationship between nipple overflow and breast cancer has caused a lot of panic among patients with “nipple overflow”. In fact, the most important and meaningful “nipple overflow” is “nipple overflow”. Nipple overflow: it can manifest as spontaneous flow of bright red, coffee-colored, plasma-like yellow or orange liquid from the fixed nipple hole. The doctor should first exclude early breast cancer, papillomatosis, and intraductal papilloma. Therefore, the doctor should first determine whether the nipple overflow is really “nipple overflow” and then arrange for the kind of examination that is appropriate. Currently, there is a lot of interest in “lactoscopy”. Think about it: if we compare the milk ducts in the breast to numerous small trees, with the roots at the nipple and the tips at the edge of the breast, how thin are the milk ducts? How thin are the endings of the milk ducts? A ductoscopy is an examination in which a very thin duct is inserted into the overflowing orifice of the breast, and then the eye is used to see what lesions are inside. Let’s think about it carefully: can you make sure that you can see every branch of the milk duct tree down to the end? Can you see everything? If the doctor does not see any disease in the milk duct, can he or she be sure that there is no disease? If the doctor sees one lesion, can he or she be sure that the other branches are not diseased? In particular, when the doctor doing the lactoscopy is “presbyopic”, he cannot find the bleeding milk hole, and after repeatedly finding it with a needle several times, the milk hole is injured, and after the examination, what happens? It turns out that the bleeding nipple hole is closed, the nipple hole that should be bleeding can not see the bleeding, you do not think that a lactoscopy, the disease is cured! So, “bleeding nipples” is a clear reason for surgery, and there is no need to do a lactoscopy, which does more harm than good.