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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.
When myofascial pain occurs, a trigger point is developed in the muscle and pain spreads throughout the surrounding area. The tendons, muscles, fascia, and ligaments may all be affected. Discomfort caused by myofascial pain may feel tender, leave a burning sensation, or create stiffness. Fibromyalgia, a chronic pain disorder, may be a cause of muscle pain. Types of Trigger Points. A trigger point is a tightened area, or knot, in the muscle. Pain begins in the area of the trigger point and eventually spreads to the surrounding tissue, called the fascia. It may continue to spread throughout the entire muscle group.