The first and most important thing to check for swollen axillary lymph nodes is the presence of neoplastic diseases, most often breast cancer, but of course, in addition to breast cancer, lymphoma and other organ malignancies can also cause swollen axillary lymph nodes. In addition to tumor diseases that lead to swollen axillary lymph nodes, there are also infectious diseases that can lead to swollen axillary lymph nodes, such as acute mastitis, trauma to the upper extremities or viral infection of the upper extremities, and tuberculosis of the lymph nodes caused by tuberculosis infection, all of which can lead to swollen axillary lymph nodes. In addition to tumor infections there are other diseases such as autoimmune diseases that can also cause axillary lymph node enlargement.