"The most common causes include repetitive or traumatic injuries to the muscles and tendons that insert onto the arm bone," says Lin ... “Any pain that is deep in the armpit and occurs without ...

Pain in the right shoulder ... causes of right shoulder and arm pain. The rotator cuff is a group of muscles and tendons that keep your upper arm bone (humerus) in the shoulder socket.

Shoulder pain is no joke ... grabbing feeling when the arm is extended away from the body," says Lamb. "Often patients will ...