Beats the shit out of me. I just woke up one day and the pain was out of this world white hot. 10 on a 1-10 pain scale. It turns out it was something muscular, but it's so deep in my lower back that I can't even quite pinpoint the source of the pain. It was feeling a lot better but then I went and aggravated it yesterday like a dumbass with...erm...vigorous physical activity, so I'm back to hobbling around. Not back to a 10, but from a 2 back to around a 6.