Breast extrusion water can be considered the following possibilities: First, if you are pregnant, most pregnant women will appear, especially in late pregnancy is more common, because the breast is affected by estrogen, progesterone, and prolactin, for the normal phenomenon of postpartum breastfeeding preparation. Second, if this is not during pregnancy is considered to be suffering from mammary hyperplasia, there will be more obvious breasts with hard lumps, pain, breast extrusion of water is clearer, the color is milky white. Third, it may be a malignant tumor of the mammary gland, mainly manifested as a hard lump in the breast, a strong sense of pain, the water extruded from the breast is more turbid, reddish in color and with a peculiar smell. Fourth, it may also be mastitis or other breast diseases, it is recommended to go to the hospital to improve the relevant examination, such as malignant lesions need to be surgical treatment.