Myofascial pain, muscle spasm, or trigger points can be primary pain generators, or accompany other pain generators like the disc, facet joint, and nerves. The muscles will tighten up due to injury in an attempt to splint and protect the injured area, but become a source of pain as well. Often times trigger points, or contraction knots in the muscles, will often develop. Trigger points can cause local pain, and are often palpable. They are often resolved with myofascial release through treatments that include chiropractic, active release, instrument assisted release and massage.