The breast is fine, but the axillary lymph nodes are enlarged and the surrounding ligamentous muscles are painful. Consider that it is caused by lymph node inflammation, lymphoma, cancer metastasis and other reasons. 1. Lymphadenitis: Inflammation caused by the invasion of pathogenic bacteria from the skin and mucous membranes, resulting in the involvement of lymph nodes in the drainage area. It occurs in the neck, armpit and groin, and is characterized by enlarged and painful lymph nodes and involvement of the surrounding muscles. 2. Lymphoma: patients most commonly have painless progressive enlargement of neck and supraclavicular lymph nodes, followed by axillary and inguinal lymph nodes. It can cause pain in the surrounding tissues when it progresses rapidly. 3. Cancer metastasis: Cancer lesions invade into lymphatic system and lymph nodes, forming metastatic tumor in lymph nodes. It causes enlargement of axillary lymph nodes and pain in the ligament muscles around the lymph nodes. If you find swollen axillary lymph nodes, you should go to the hospital for examination in time to clarify the cause of the disease so as not to delay the condition.