80% of breast cancer patients are first diagnosed with a breast lump. Breast lumps are often found unintentionally in women and are mostly solitary, hard, with irregular margins and a poorly smooth surface. Most breast cancers are painless lumps and only a few are associated with varying degrees of vague pain or tingling. If there is blood, plasma, milk or pus flowing from the nipple during non-pregnancy period, or if there is still milk flowing after stopping breastfeeding for more than half a year, it is called nipple overflow. There are many causes of nipple overflow, and common diseases include intraductal papilloma, breast hyperplasia, ductal dilatation of the breast and breast cancer. Unilateral uniportal hemorrhagic overflow should be further examined, and more attention should be paid if accompanied by a breast lump. The most common sign is that the tumor has invaded Cooper’s ligament, which connects the breast skin and deep pectoralis fascia, causing it to shorten and lose its elasticity, pulling the skin in the corresponding area, resulting in the “dimple sign”, which is a small dimple in the breast skin, like a small dimple. If the tumor is located in or close to the deep part of the nipple, it may cause nipple retraction. If the tumor is far away from the nipple, the nipple may also be retracted or elevated when the large ducts in the breast are invaded and shortened. Initially, the lymph nodes in the ipsilateral axilla may be enlarged. The enlarged lymph nodes are hard, scattered and can be pushed. As the disease progresses, the lymph nodes gradually fuse and become adherent and fixed to the skin and surrounding tissues. In the advanced stage, metastatic lymph nodes may be felt in the supraclavicular and contralateral axillae.