In normal people, there are lymph nodes in the breast, which will not be touched and will not have obvious symptoms. Some diseases can affect the lymph nodes and make them swell, thus showing different symptoms. Consider mastitis or breast cancer for swollen lymph nodes at the breast: 1. Mastitis: nipple injury leading to bacterial infection of the breast, or milk accumulation during lactation may cause mastitis, which is manifested by swollen lymph nodes in the breast, local redness, swelling, fever, pressure pain in the breast, and some patients may also have axillary pain. In addition, severe mastitis may also lead to fever, and at this time, swollen lymph nodes are also the cause of activation of the immune system of the organism. 2. Breast cancer: If the swollen lymph nodes are caused by breast cancer, patients can touch painless nodes around the breast, and can also touch the swollen lymph nodes in the armpit, and the lumps in the breast will gradually grow with time, and patients may lose weight. Once abnormal breast lesions are found, it is important to go to the hospital in time for examination, especially when the axillary lymph nodes or breast lumps are touched, because early detection and early treatment of diseases on the breast is beneficial to the prognosis.