A chronic musculoskeletal pain disorder. Pain may occur when "trigger points," or especially tender areas on the body, are touched, or in other points in the body.
Myofascial Pain Syndrome (or MPS) is a term used to describe one of the conditions characterized by chronic pain. It is associated with and caused by "trigger points" (TrPs), sensitive and painful areas between the muscle and fascia. Simons has visibly identified and documented these contraction knots through electromyographic imaging, ultrasound, and biopsy.