[Patient] Milky white sticky stuff sometimes oozes from the nipples and smells bad. Answer】This condition is usually caused by nipple overflow. During non-pregnancy and non-lactation periods, fluid sometimes comes out of the nipple called nipple overflow. It is a common symptom of breast disease; according to statistics, those who visit the doctor with nipple overflow as their primary symptom account for about 10% of breast disease, and the incidence is second only to breast lumps and breast pain. Anatomically, the nipple usually has about 16 milk duct outlets. Nipple discharge is divided into unilateral and bilateral nipple discharge. Unilateral nipple discharge, especially in fixed sites (one milk duct outlet), requires exclusion of intraductal papillomas, which are usually yellow or yellowish in color and sometimes appear as bloody discharge, i.e. dark red, coffee or dark brown; in rare cases, especially in postmenopausal women, bloody discharge is a warning for breast cancer; in case of purulent discharge, possible diseases are ductal dilatation (plasmacytosis If the discharge is purulent, the possible diseases are ductal dilatation (plasmacytosis) or cystic hyperplasia of the breast; if the discharge is clear water-like, it may be related to endocrine or breast hyperplasia in the body. The above is not absolute, and clinically clear, milky, mucous overflow results in breast cancer are also seen. Therefore, recurrent overflow from unilateral fixed sites should be seen promptly to exclude major diseases. Bilateral overflow mostly has nothing to do with the breast itself, especially non-fixed site overflow, which is mostly physiological, such as clear, bright nipple overflow before and after menstruation is basically a normal situation and can also be seen in breast hyperplasia. If it is milk-like, especially recently after weaning or miscarriage, it is usually caused by endocrine reasons in the body, and it is not a big deal, and will usually recover gradually. If the discharge is prolonged, an abnormal increase of lactogen in the body should be considered, and in rare cases it is due to pituitary tumors or adrenal tumors, which requires vigilance. Milky white nipple discharge may be caused by milk-like overflow, and if combined with nipple invagination and no attention is paid to frequent cleaning, odor can easily appear; if not the above-mentioned situation, there can be sweat cells in the nipple area like axillary odor, which secrete odorous fluid, and odor can also appear. If the nipple is invaginated, it can be corrected by treatment, if the latter, there is no effective treatment yet, except for attention to hygiene.