The nipple discharge smells bad consider the following conditions caused by: first, due to unscientific feeding during breastfeeding caused by nipple chaps, chaps where purulent disease caused by septic odor. Second, due to the nipple has a local bacterial infection caused by the inflammatory reaction, you can apply cream for treatment. The third, due to inattention to personal hygiene, long time no cleaning nipples caused by the accumulation of dirt odor, need to be promptly cleaned. Fourth, due to chronic inflammation inside the breast ducts caused by this symptom will appear old cheese-like secretions, mainly due to the accumulation of secretions for too long, dry dehydration after the odor. The odor of the discharge may also be caused by inflammation of the breast, and if it is accompanied by pain, it is recommended to go to the hospital for appropriate treatment.