A trapezius strain is a muscle or tendon injury that limits movement and strength in the arms. It occurs when the fibers are stretched beyond their typical limit. In severe cases, it can lead to a ...
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 ...