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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.
Chronic myofascial pain (CMP), also called myofascial pain syndrome, is a painful condition that affects the muscles and the sheath of the tissue â called the fascia â that surround the muscles. CMP can involve a single muscle or a group of muscles.ain originating in the muscles and fascia is very common. Nearly everyone at some point suffers from this type of pain, known as myalgia fascitis or myofascitis. CMP, however, involves pain that is chronic, or long lasting, and is associated with specific trigger points.