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 ...

Doctors use trigger point injections to treat chronic muscle pain and other issues that affect the musculoskeletal system. They can cause side effects, including temporary numbness and dizziness.

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 ...