Chronic Pain Syndromes: Myofascial Pain Syndrome.

Myofascial pain syndrome (MPS) is a regional musculoskeletal pain disorder characterized by trigger points within the muscle or fascia. There are no universally accepted diagnostic criteria. Diagnosis currently is based on a physical examination finding of at least one localized trigger point that, when palpated, recreates the pain at the site or produces pain away from the site in a referral pattern.