Fibromyalgia is one of the most common rheumatic diseases, second only to osteoarthritis. It causes chronic muscle pain and fatigue. Acupuncture functions by targeting specific nerve pathways to different organs or parts of the body. Research has shown that acupuncture is effective in decreasing or eliminating people's sensitivity to pain in targeted regions. However, some believe that the reduction in pain is due to a placebo response rather than acupuncture itself. This study will use two brain-imaging techniques to determine the brain response to acupuncture versus a simulation of acupuncture, thereby assessing whether acupuncture is actually effective in relieving pain.