Hello,
I have been having some Kidney issues of late, though I don't know what's what as I am STILL being investigated. Recently, I have been suffering from a sore back, pain could be left, right, middle [lower spine] though mostly it seems to be in the front right about where by upper rib is. The pain seems to be getting worse [could it be serious?], and I noticed my urine getting darker, so I peed in a clean clear plastic bottle [I sometimes do that just to keep an eye on it] and I for the first time noticed lots of little black bits in my urine. What on earth could this be? I've had bright red urine a couple of years ago [blood and not diet related], and after that, I thought nothing would surprise me, but these little black bits really did surprise and indeed worry me.