I used to have minor issues with my kidneys if I d drink too much Pepsi. Having switched to RC pop, the issues have been far & few, although for about the last week, I noticed an area just above left hip, about the size of 2 human hands that felt tender. Since then, it has spread to the back a little, & also around the front, just under my belly button. Haven t noticed any change in urine & have no fever, although my iron level has been low (& I stopped taking iron pills a few weeks ago). Ibuprofen doesn t seem to help much. I had a double groin hernia surgery 6 years ago, could it be the mesh from THAT that s bothering me? or more likely a kidney issue? Thanks!