I know that your lower back should arch and little when laying down. Well I think I know heh. But my problem is that when I am laying down flat on my back, my lower back seems to arch a good almost three maybe almost 4 inches off the ground. I was wondering if this could be the cause of my back problems that I’ve had for a while. I’m only Nineteen and just notice this when my girlfriend pointed it out that my lower back arches up pretty high. It sometimes hurts a lot or hurts a little. But right now I can’t even touch or sit back in my chair it hurts so much. Should I sleep with something under my lower back?