Any time there is pain in the body, you have sensory nerves which are firing and you might or might not have a structural problem causing the sensory dysfunction. In most cases chronic pain has no structural cause. The problem with most doctors who are not well versed in the field of neurology is their immediate assumption that if you have pain, there must be a structural reason for the pain. In other words, there must be some form of structure, either bone, soft tissue, disc or some object actually pushing on the sensory nerve, causing it to continuously fire. This assumption is not always true.