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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 involves the fascia (connective tissue) and muscles. Trigger points are knots in the muscle tissue that can cause tightness, weakness, and intense pain in various areas of the body. For example, a trigger point in the shoulder may result in headache.owever, tension-type headache pain is not worsened by routine physical activity. Dental Problems. Jaw clenching or teeth grinding, especially during sleep, are signs of temporomandibular joint dysfunction (TMJ, also known as TMD). TMJ pain can occur in the ear, cheek, temples, neck, or shoulders.