Physical injuries
Physical arm injuries could happen if you fall while playing sports, running for the bus, or slipping on a wet floor. You can also injure your arm if you're in a car accident or by hyperextending (overextending) your elbow, which can happen if you fall or participate in sports like gymnastics or football.
Broken bones. If your arm starts to hurt right after a physical injury, you may he fractured it. You might also he swelling, bruising, numbness, or weakness. Seeing a doctor as soon as possible gives your arm the best chance of healing properly if it is broken.
Strain or sprain. An injury can cause damage to your muscles (a strain) or your ligaments (a sprain). Symptoms include pain, swelling, bruising, weakness, and muscle spasms. Both conditions will usually heal on their own with self-care, but if your symptoms are severe, you should see your doctor as soon as possible.
Rotator cuff injury. Your rotator cuff is part of your shoulder and is made up of muscles and tendons. It allows your shoulder to move or stay in place. As we age, tendons in the rotator cuff begin to wear down or tear. If you he a job where you make overhead motions over and over, you can damage it, too. Symptoms of a rotator cuff injury range from a dull ache and weakness in your arm to severe, constant pain. If you suspect a rotator cuff injury, see your doctor. You may need physical therapy.