Often referred to as "muscle stim," the therapy involves low levels of electrical impulses delivered to the injured, painful tissues to reduce pain and speed healing. Often described by patients as a pleasant, "tingling" sensation, or "electrical massage," these impulses stimulate the body to release natural pain relievers, called endorphins. These endorphins reduce pain and inflammation, thereby promoting faster healing of the injured tissues. This therapy is often used to treat acute or chronic pain, as well as strains or sprains of the muscles, joints, and soft tissues of the spine and extremities.