Season 11 American Idol winner Phillip Phillips has canceled the remaining nine dates of his current college tour due to illness.
Phillips has suffered from ongoing kidney issues, and was also "bordering on exhaustion" due to a strenuous six shows a week schedule, a source from Phillips' camp tells ET.
Phillips had surgery last June to remove massive kidney stones, which sidelined him during his run on AI.
"Hey guys, due to doctor's orders I have to postpone my last few tour dates. They will be rescheduled!," Phillips wrote on his Facebook page. "Looking forward to seeing you all on the John Mayer tour this summer!"
Phillips' shows with Mayer are set to begin in July.