I threw my back out a couple of years ago and I could hardly walk. My wife took me to get acupuncture and I gotta say it made it better for me. Wasn't 100% but I felt great afterwards and could actually walk like a normal human being. Still had pain but wasn't anything near what it was.

The doc basically explained it to me, that when your body has a foreign object in it, it rushes blood to the area. They are triggering an increase of blood flow to certain areas to help alleviate pain or chronic condition you may have.