Rick Ross is in the hospital for a serious medical condition ... TMZ has learned. We're told Rick took ill in the Miami area at his home. Someone from the home called 911 at 3:30 AM Thursday and said the person in distress was breathing heavy and unresponsive. The caller said the man in distress had a history of seizures -- something that has plagued Rick -- and they were trying to wake him up but he was "slobbing out the mouth."