The trapezius, trapezoid, or traps muscle is a muscle in the upper back. It stabilizes the shoulders and enables the neck to move. Certain stretches can help ease pain and keep movement flexible. The ...

If you’ve got a lump on top of your shoulder muscle, you have a good chance of it being a trapezius knot. This type of lump in the trapezius muscle — called a myofascial trigger point — is among the ...