Enlargement of lymph nodes after axillary dissection may be caused by metastasis of cancer cells, or it may be related to inflammation. 1. Metastasis: swollen lymph nodes in armpit may be caused by breast cancer, which can usually be treated by axillary lymph node dissection. However, if the condition of breast cancer is serious and metastasis has occurred, there is still the possibility of recurrence after surgery, so it is recommended to go to the hospital for consultation and treatment in time. 2. Inflammation: Lymph nodes belong to an important part of the immune system, and when there is infection in the lungs, hands, upper arms, or surgical wounds, it will easily lead to swelling of axillary lymph nodes. Usually, when the primary inflammation is eliminated, it can gradually recover, so there is no need to worry too much. However, you should still go to the hospital as soon as possible. Swollen lymph nodes after axillary clearance should also be seen for other reasons, seek medical help in time to avoid delaying the condition.