Ronnie from 'Jersey Shore' -- My Kidneys Were Ticking Time Bombs

Ronnie from "Jersey Shore" just survived something more painful than a summer with Snooki -- 10 agonizing days in the hospital with kidney stones ... TMZ has learned.

Sources in Ronnie Magro's camp tell us the 27-year-old got out of a Florida hospital Wednesday after undergoing two surgeries to treat kidney stones ... and more.

Ronnie initially went in for the stones, but we're told docs discovered he was born with a hereditary disorder that's also fouling up his kidney function.

Doctors still haven't cleared Ronnie to fly -- so he's stuck in FL for the time being.