Mariah Carey's husband Nick Cannon suffers 'mild' kidney failure

And Mariah wasted no time tweeting this picture and "please pray for Nick as he's fighting to recover from a mild kidney failure." I'm no doctor (no, really) so I don't know what "mild" kidney failure means. And this message doesn't really explain it either:

This is us in the hospital - role reversal; Last year it was me attached to the machines (after having dembabies) and Nick was there with me through it, and now here we are.

We're trying to be as festive as possible under the circumstances but please keep Nick in your thoughts because this is very painful. They tried to kick me out of the hospital but here I am pon de bed with Mr. C.

We're doing OK but we're "straaaaaanded in Aspen". #DramaticDivaPlace (I know, we could be in a lot worse places) but the truth is as long as we're together, we're OK. I'm not trying to make light out of the situation because it's a serious moment that's very tough on all of us so please keep us and our family in your prayers. LYM.