“But Doc, all I did was bend over! My low back really hurts and it’s not going away. How can that happen?” This is a familiar question in a chiropractors office.A simple explanation is that your nervous system is structured like a dam with a spillway. The bottom of the lake behind the dam is normal, and when water comes over the spillway is the first that you will feel symptoms. There is a all that distance between the bottom of the lake and the spillway that is not normal, but is not bad enough to trigger symptoms. So if your lake is within an inch of the spillway, you think you are fine because there are no symptoms. In that situation, sometimes all it takes is a simple movement to start the cascade of pain, spasm, and inflammation. Just because you have no pain does not mean everything is perfectly well.