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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, which is defined as condition of multiple trigger points present in all four quadrants of the body for at least 6 months. 7