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Sensitive areas of tight muscle fibers can form in your muscles after injuries or overuse. These sensitive areas are called trigger points. A trigger point in a muscle can cause strain and pain throughout the muscle. When this pain persists and worsens, doctors call it myofascial pain syndrome. 1  Symptoms.
Myofascial pain syndrome is a chronic local or regional musculoskeletal pain disorder that may involve either a single muscle or a muscle group. The pain may be of a burning, stabbing, aching or nagging quality. Common symptoms. How bad it is.