He announced the news on Twitter and his Facebook page, assuring fans that the shows will be rescheduled. "Hey guys, due to doctor's orders I have to reschedule my last tour dates. They will be rescheduled! Looking forward to seeing you on Mayer!"

"His doctor said he has to get off the road," a source tells The Hollywood Reporter. "He was playing six shows a week, and it's too much for him."