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 ...

Trigger point injection (TPI) may be an option for treating pain in some patients. TPI is a procedure used to treat painful areas of muscle that contain trigger points, or knots of muscle that form ...

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.