Shoulder hurts when its hanging down its either the side or back. left shoulder.hurts bad what can i do cause it hurts?

get checked: There are a number of possibilities, and if it is pretty severe, i would encourage you to be checked. Probably the three most common causes are a problem in the shoulder itself, such as a rotator cuff tear, a problem in the neck such as a pinched nerve, or a non -musculoskeletal, referred pain to the left shoulder. Each cause has different treatments, so appropriate diagnosis is key.