Yellowish water can be squeezed out from the nipple, which is a manifestation of nipple overflow and may be related to breast milk stagnation, mastitis, breast hyperplasia and breast cancer. 1. Milk stagnation: If the patient belongs to the breastfeeding period and squeezes out yellowish water, it is possible that the milk remains in the breast for a long time, which leads to the change of the color of the milk. 2. Mastitis: If the patient has mastitis, the inflammatory secretion accompanied by the milk overflow will cause the milk to become yellowish or yellow pus color. 3. Mammary hyperplasia: Mammary hyperplasia is typically characterized by hard lumps in the breast, breast overflow, breast pain, etc. It is affected by the physiological cycle, and the symptoms are obvious before the onset of menstruation. 4. Breast Cancer: If yellowish water comes out of the nipple and is accompanied by symptoms such as orange peel-like changes in the breast, breast pain, and swelling inside the breast, it may be a manifestation of breast cancer. In addition, intraductal papilloma of the breast may also appear similar clinical manifestations, due to the complexity of the etiology, it is recommended that the patient consult the doctor in a timely manner, and follow the doctor’s instructions to do a systematic examination.