been hospitalized 5 times for stones . Last one I passed was 8mm after 3 days in the hospital. Its from dehydration. I drink so much water or gatoraid that my piss is almost always clear. Havent had any problems since I started doing that, only downfall is up pissing all night everynight. Fucking sucks , but the pain from a stone is worse. Hope you get better , man . High uric acid causes it too , like asparagus and red meat. Sodas will kill you anyway, so I completely stopped. But in the end I'll prolly get cancer from the water so it's prolly for nothing anyway