Can someone please tell me about trigger points and lactic acid? I have upper back/shoulder pain that contains a huge knot. I was informed that the knots are actually a build up of lactic acid. What is the best treatment for that? I know that being adjusted by a chiropractor does not help, however it does feel slightly better after he uses an untrasound/stimulator on it. Should I consider massage therapy to work out the knots?? THANKS