In the second of our two-part series on Japanese acupuncture, we zero in on its most widely used application: pain-relief. It has long been known that acupuncture can ease pain, and Japanese research is shedding light on the reasons. Holding the keys are blood flow, brain waves, and the autonomic nervous system. We explore acupuncture's potential by seeing how it has helped a migraine sufferer and a fibromyalgia patient.