Personally I think it's the pain that causes depression. There's been studies though that says depression causes pain though, but I think if there's something already structurally wrong it's the other way around. I get depressed when I'm in too much pain, but my pain is constant around a 6-7 most days. That I can handle. It's when it gets to 8+ I can't take it anymore, so I usually get high asf and just space out for hours. heh.