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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.
This is one of those things that reminds you FMS just doesn't make a lot of sense. A lot of us get pain that migrates around the body, sometimes moving between certain places, sometimes striking in new areas. If you also have myofascial pain syndrome, it can be especially hard to tell randomly roving pain from the referred pain caused by trigger points.