Almost everyone experiences pain at some time. Pain can be a natural response to injury and disease in some instances. With the advent of pain medicine as a medical specialty, patients no longer need to suffer. Suffering is how our lives are affected. Patients who suffer have significant reductions in the normal joys of their lives. They cannot enjoy their families or enjoy recreational activities etc. Their pain affects them emotionally. Pain is an unpleasant sensory and emotional experience following tissue injury. Pain occurs as a response to tissue irritation, injury, infection, ischemia...