Yellow water from the breast without squeezing is clinically classified as nipple overflow, which may be a physiological phenomenon, such as yellow liquid overflow from the nipple after weaning or after miscarriage. In addition, if accompanied by other uncomfortable symptoms, it may also be seen in cystic hyperplasia of the breast, ductal dilatation, intraductal papilloma and other diseases, which require timely treatment. The physiological situation: 1, can be seen in the post-weaning or post-abortion and some women before and after menopause, this is mostly bilateral nipple overflow, if not accompanied by other uncomfortable symptoms, more do not need to carry out special treatment, pay attention to breast cleaning can be; 2, can also belong to the pseudo-overflow, mostly seen in women with sunken nipples, due to the accumulation of secretions, not timely cleaning can appear nipple extrusion yellow liquid, often accompanied by odor, pay attention to hygiene Cleaning can make the symptoms ease. Pathological causes: 1, cystic hyperplasia of the breast: mainly due to the imbalance of the ratio of estrogen and progesterone, often manifested as unilateral or bilateral breast lumps and breast swelling or tenderness and other symptoms, the symptoms appear and fade with the menstrual cycle, a few patients can be seen when squeezed nipple overflow. For patients with poor results of drug treatment or the possibility of malignancy, the lesion can be surgically removed and pathological examination can be performed; 2. Ductal dilatation: also known as plasmacytoid mastitis, mostly associated with milk duct obstruction, bacterial infection, abnormal blood hormone levels and local trauma, surgery, etc., patients can see nipple overflow when squeezed, and pressure on the breast can overflow It can be accompanied by local redness, swelling, pain, fever, and lumps. Clinical treatment is mainly surgical, and according to different stages of development, surgical methods such as mastectomy, segmental mastectomy and simple mastectomy can be adopted, and anti-estrogen drugs such as triamcinolone can also be taken; 3. Intraductal papilloma: Mostly due to abnormally high estrogen levels, patients often have no obvious symptoms, and nipple overflow can be seen when squeezed, and the overflow can be bloody, dark brown or yellow liquid. For solitary intraductal papilloma, the lesioned ductal system should be removed and routine pathological examination should be performed after surgery. If the level of serum prolactin is elevated due to long-term use of contraceptives and antipsychotic drugs, the phenomenon of yellow fluid overflowing from the nipples may also occur.