…lupus or rheumatoid arthritis, may also cause generalized lymph node swelling.
4. Cancer:
Infiltration with malignant cells (metastases) brought to the node with the lymph flowing from an area of certain types of cancer. In rare cases, breast cancer or lymphoma may cause swollen lymph nodes in the armpit. Rarely, a person may have a node or group of nodes that grows rapidly and becomes hard and can not be easily moved around under the skin. These may indicate a tumor.
5. Cancer of the Blood:
Uncontrolled, malignant multiplication of lymphocytes as in lymphoma or leukemia.