Introduction Fibromyalgia is a rheumatic disorder characterized by chronic achy muscular pain that has no obvious physical cause. It most commonly affects the lower back, the neck, the shoulders, the back of the head, the upper chest and/or upper thighs, although other areas of the body may be involved. The pain is usually described as burning, throbbing, shooting, or stabbing. Activities such as lifting and climbing stairs are often very difficult and painful. Depression is frequently...