Benign breast nodules do not always cause swollen lymph nodes in the armpit. Generally, benign breast nodules or hyperplastic nodules do not cause enlargement of the lymph nodes in the armpit. If the nodule is inflammatory, the prolonged stimulation of the inflammation may lead to enlargement of the lymph nodes in the armpit. However, in general, benign breast nodules do not cause axillary lymph node enlargement. If the nodule has the tendency of malignant transformation and is accompanied by axillary lymph node enlargement, it may be caused by malignant tumor of the breast that has metastasized to the axillary lymph nodes, thus leading to lymph node enlargement. You can go to the hospital for examination to clarify the cause of the enlarged axillary lymph nodes and deal with the cause.