Trigger Point Injections are used to treat pain from muscle tightness and sometimes from fibromyalgia. Trigger points are tight tender muscles that cause pain at the area and sometimes will refer pain to other areas. This source of pain has to be treated by loosening the tight muscle. Trigger point injections accomplish this by the injection of sterile fluid, usually lidocaine, along with the movement of a very small needle to loosen up the muscle. They are the injection equivalent of a super deep tissue massage and are covered by most insurances.