Hello~This could be a circulation issue or even a pinched nerve issue. I would discuss this with your GP and if nothing series is discovered, then I would see a chiropractor. If you have some pinched nerves in your lower back, you can have that burning sensation. The chiropractor will take some x-rays, look them over and then discuss the findings with you. After a few adjustments, if it is indeed a pinched nerve, you should start to feel better.