Long before you learned you had fibromyalgia, you'd already known pain. You felt it when you got a splinter in your finger or twisted your ankle playing sports. You felt pain when you jammed your toe into the dresser or sliced your finger on a piece of paper. But according to people who have fibromyalgia, the intensity of the pain that comes with FMS is unlike anything you might have felt before. Because pain is at the core of fibromyalgia, it helps to understand the concept of pain itself.