Back pain?... let me tell ya 'bout back pain... lol - but seriously Gretchyn, if you have any issues with your back to begin with, when you throw a little bit of a lupus flare in there, and it's associated inflamation, it's a recipe for a worsening of the back symptoms. You can get into a vicious cycle of inflammation, back pain, muscle tightening, more inflammation, more pain, more tightening, etc. I was diagnosed with ankylosing spondylitis about 20 yrs ago (back arthritis), just after my RA diagnosis. Apparently, I didn't think that was bad enough, and then compounded my situation by falling off of a ladder a few years later. Anytime there's even a hint of a flare, my lumbar will "itch" really deep in the bones, then start hurting pretty good. As things progress, I'll throw in some muscle spasms and weird leg twitchings too (it's my version of dancing, since I'm awful at dancing anyway... tic). Lupus is autoimmune, so it's not beyond the realm of things for you to have other connective tissue issues anyway. An MRI is about the only way to be certain when it comes to your back, so if you have a particular spot that gets hit consistently when you flare, then that might be the next step. As far as I'm concerned, when a doc tells you that "it's not bad enough to cause the pain" you're having, they're speaking out their backside (stinks, too), and should be told so, maybe even fired, and a compentant, compassionate replacement found... just my opinion.
"There but for the grace of God, go I."
"... His mercy endureth for ever."