Injury Left arm pain can be caused by an injury such as a bone fracture, bruise, or tendonitis. A broken bone can cause significant pain, swelling, and bruising and may produce a noticeably out-of ...

Pain in your left arm can be due to a number of causes ... Call 911 if you or someone near you is experiencing symptoms. 3. Muscle sprain and strain Both sprains and strains of your shoulder ...