How can i tell the difference between rotator cuff and pinched nerve?

rotator cuff: Best to be evaluated by an orthopedist, and likely imaged with mri. However, generally a rotator cuff tear will hurt in the shoulder and have weakness and pain with shoulder range of motion. Pinched nerve (usually in the neck) causes pain more in the shoulder blade area and radiates down the arm with associated numbness, tingling, or burning.