The theory about how it works is that there the nerves can only transmit a small amount of information because of their limited capacity. When you transmit signals that override your pain (back ache, headache, arthitis, etc), it blocks the signals from reaching your brain. There's othe theories about how it works as well. One I've heard has to do with the bodies electromagnetic fields. Studies have shown that acupuncturists that display a strong sense of "mysticism" have better results than those that have a clinical approach. That does imply a placebo effect.
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I feel sorry for people who don't drink. When they wake up in the morning, that's as good as they're going to feel all day.
-Frank Sinatra
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