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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.
The term myofascial was first used in medical literature by Janet G. Travell in the 1940s in reference to musculoskeletal pain syndromes and trigger points. In 1976, Travell began using the term myofascial trigger point and in 1983 published the reference Myofascial Pain & Dysfunction: The Trigger Point Manual.