Nipple squeeze out white secretion normal or not related to its cause, can be divided into three cases. First, when a woman is in puberty due to increased levels of estrogen, mammary duct hyperplasia, interstitial edema, squeeze the nipple can be white secretion discharge, generally do not give special treatment. Secondly, when a woman is in lactation or pregnancy, the pituitary gland secretes lactogen, and the white secretion that appears when squeezing the nipple is mostly milk, which is a normal physiological phenomenon. Third, breast hyperplasia or ductal papilloma in the breast due to abnormally high estrogen, squeeze the nipple will appear milky white or yellowish fluid is abnormal, often need to consult a doctor in time. Once the nipple secretion of white fluid occurs during non-lactation or non-growth period, it is abnormal and should go to the breast surgery department of regular hospitals to clarify the nature of the lesion and carry out reasonable treatment under the guidance of specialists.