Lidocaine trigger point injections relieve musculoskeletal pain

A trigger point in a muscle is a knot that occurs when the muscle fails to relax. Normal muscles at rest are relaxed with the ability to contract or stretch; trigger points develop when the muscles are too restricted and cannot move properly. Trigger points appear for a number of reasons, including injuries, stress, inflammation, trauma or poor posture. Injections are often used to treat trigger points in the arms, legs, neck and lower back.