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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.
Abdominal wall pain can be thought of as one category of myofascial pain. In this situation, muscle or fascial strain can lead to a pain trigger point. The mechanism for the pain may involve the development of an area of hyperalgesia as a result of myofascial stretch injury.