There are many reasons for breast bleeding, specifically the following: 1, breast trauma. If a frontal fall landing on the breast, a cut on the breast or excessive friction leading to nipple injury can cause breast bleeding, active hemostatic and anti-infective treatment, and wearing loose, non-lethal underwear to help the wound recover. 2, breast enlargement or mastitis. These basically occasionally see bloody overflow, will be accompanied by breast lumps and breast swelling, stinging pain, nipple cracking and other symptoms, the lighter does not need treatment, the heavier symptomatic treatment and endocrine therapy. 3, breast cancer appears bloody overflow should be highly alert, often accompanied by skin bump, breast pain, this situation can go to the hospital to do breast ultrasound or mammogram, and active surgical treatment, removal of the breast, post-operative regular chemotherapy, regular follow-up. After surgery, regular chemotherapy, regular review and follow up for discomfort.