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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.
Muscle pain affecting the body's soft tissue is called myofascial pain syndrome or MPS. The fascia is connective tissue covering the muscles. Myofascial pain syndrome may involve either a single muscle or a muscle group. In some cases, the area where the pain is felt may not be where the myofascial pain generator is located.