Conversely, a condition affecting your upper arm may be felt around your shoulder ... or if pain happens with numbness or increasing swelling.

Armpit pain is a common complaint that can have many causes, from mild muscle injuries to swollen lymph nodes and ... rib cage and wing bone to the upper arm bone, says Lin.

This condition causes intense pain in the upper arm and a noticeable bulge ("Popeye ... leading to internal bleeding and ...