Hello, I ve had problems with my backpack r years but doctors can t seem to figure out what it is. It s shooting pain mainly in my left side of the back and makes me collapse on a rare occasion. Also, when I bend over to a certain angle, I struggle to get back up and it hurts. Daily chores are a struggle but I ve had an X-ray and nothing was found. When I was a young teenager, I do remember a speaker from a stereo falling on my back. I think it is from that, but like I said, doctors won t help much :(