Pain isn't a signal from damaged tissue but something your brain creates. When the sensory loop from your skin to your brain breaks down, your brain generates pain even without structural damage. Imaging shows nothing wrong because the problem is miscommunication between brain and body, not injury. You can improve it by giving your brain different sensory input.
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And when we really dive into pain science, we start to see that if something hurts, say it's your lower back, it's not your lower back that actually hurts, it's the representation of your lower back in your brain. So there's a whole system that works its way through from the skin into the tissues all the way up to the brain, and if things aren't flowing correctly, you're going to end up with a perception of pain. Or stiffness or immobility. There could be all kinds of different things that happen. Pain is the most common one that we see. So oftentimes people will come to me and they'll say, oh, my lower back's been hurting. I went to the doctor, they did x-rays, MRIs, and they said there's nothing wrong and it still hurts. What's happening? Well, what's happening is that the system from the lower back all the way up to the brain is malfunctioning somehow, and we can fix that by giving the brain different input.