Back pain can have causes that aren’t due to underlying disease. Examples include overuse such as working out or lifting too much, prolonged sitting and lying down, sleeping in an uncomfortable position or wearing a poorly fitting backpack. Back pain is a very common problem and will affect many of us at some point during our lives. The good news is that in most cases it isn’t a serious problem, and it might just be caused by a simple strain to a muscle or ligament. As far as possible, it’s best to continue with your normal everyday activities as soon as you can and to keep moving.