An armpit lump—or axillary lump—can occur as a symptom of many conditions that range from harmless to serious. It is often the result of an enlarged lymph node. Many armpit lumps appear and then go ...

The axillary artery continues down the arm to become the ulnar and radial arteries (supplying oxygenated blood to the arm). Arises from the brachiocephalic trunk (the first branch to arise from the ...