How common is
back pain. I have, for about half a year now, experienced
back pain when I stand up straight and walk to class -- especially with my backpack on. It's dull, and achy, and occasionally pretty bad. When I stand up and endure it for a long period, like standing up straight, it almost feels hard to breath, like someone is sitting on my lungs. I know I have had bad posture problems from never sitting up straight in school when I was younger, but never this bad to where it hurts.