The pain associated with shoulder impingement is usually in the deltoid muscle's lateral (middle) and anterior (front) portions. Repetitive overhead motions, such as swimming, baseball ...

A dull feeling in your left arm could be from overuse or strain. Learn what causes pain on this part of the arm here and ...

The deltoids are the muscles that cover the front, back and side of the shoulder joint — and they are essential for everyday movements like raising your arms, lifting a child or carrying groceries.