When in the physiological period and growth period, due to the increase of estrogen, the nipples can secrete cool colored fluid as a normal physiological phenomenon. If there is water in the nipples during the reproductive age, it is mainly considered to have cystic hyperplasia of the breast, which is manifested by the nipples secreting yellowish fluid and accompanied by breast swelling and discomfort. The first is acute mastitis, which is an acute purulent infection of the mammary gland, where the nipple can ooze white, sticky, purulent fluid and can be accompanied by severe breast pain. Secondly, during breastfeeding, due to excessive milk production, milky white milk can be seen from the nipple, if there is light blood-colored water in the nipple, consider suffering from intraductal papilloma or breast cancer, squeezing the nipple can be seen when the bloody liquid oozing, the amount is not much. When you feel water in the nipple, you should go to a regular hospital for breast surgery or general surgery in time to clarify the cause of the disease, so as to achieve early detection and early treatment.