Just as in angina, heart attacks can cause sudden left arm pain. A 2013 study found that 17% of the surveyed people who had heart attacks also had radiating pain down the shoulder, upper arm ...

A pinched nerve in the neck, or cervical radiculopathy, can cause radiating pain to the shoulder, and muscle numbness or weakness that can spread down the arm to the hand. This may resolve on its own.

People who spend hours in front of a computer or behind the wheel are especially at risk. The pain usually starts in the upper back and can spread to the shoulder or down the arm.

Sometimes, poor posture can lead to non-specific pain that radiates ... grab it with your other arm, pull down and tilt your head away from that shoulder to give your deltoids and traps a deep ...