Answer : The axillary lymph nodes are located in the armpit area and they help filter out harmful substances and fight infections. When you injure your left hand, bacteria or viruses may enter your body through the wound and cause inflammation in the nearby lymph nodes. This can lead to swelling and pain in the axillary lymph nodes on the same side as the injury. This is a common and usually harmless response of your immune system to fight off the infection However, if the swelling persists for more than a few weeks, or if you have other symptoms such as fever, night sweats, or weight loss, you should see a doctor as it could be a sign of a more serious condition