Trigger points are tender areas within skeletal muscle that may result from primary abnormality of the muscle itself, or as a secondary phenomenon when nerves that supply muscles become irritated. Pain from trigger points may be mild or severe. When trigger point pain is severe and refractory to conservative measures, trigger points may be injected with steroids using tiny needles of variable lengths placed through the skin and into the substance of the muscle. Five to ten trigger points may be injected in one session. Many patients respond with long lasting benefits from a single session of trigger point injections.