updated 02/17/2012 AT 3:50 PM ET
•originally published 02/17/2012 AT 5:45 PM ET
Nick Cannon is not a guy who slows down easily.
The 31-year-old star, who has been helming two radio shows out of New York, as well hosting America’s Got Talent in L.A. – not to mention being the father of twins! – has run himself ragged and didn’t give himself time to recover from kidney failure earlier this year, a source tells PEOPLE.
“He didn’t give himself time out of hospital. It was getting worse,” says the source close to Cannon. “Waking up that early in the morning and his travel schedule was grueling. He should have been recovered at this point.”