Pain in your left arm can have many different causes, from injuries and muscle strain to a pinched ... for the top of the ...

However, some causes of left shoulder pain may be related to organs ... The rotator cuff is a group of muscles and tendons that keep your upper arm bone (humerus) in the shoulder socket.

Armpit pain is a common complaint ... blood vessels and lymph nodes, as well as muscles and tendons that connect the chest, rib cage and wing bone to the upper arm bone, says Lin.

These include the nerves, blood vessels and lymph nodes, as well as muscles and tendons that connect the chest, rib cage and wing bone to the upper arm bone ... If undiagnosed and left untreated, HS ...