BEIJING, Sept. 14 (Xinhuanet) -- America singer Kelly Clarkson canceled six upcoming U.S. tour dates after doctors advised the singer to rest her voice.

"So bummed that I have to cancel some of my tour dates. This kills me, but doctors are saying I need to rest my voice!" Clarkson wrote in her social media account, "Please know that I never cancel anything unless it's absolutely necessary."

Clarkson's rest continues through Sept. 20. She has canceled six shows: two in Vienna, Va, one in Tampa, Fla.; one in West Palm Beach, Fla.; one in Raleigh, N.C.; one in Camden, N.J.

Clarkson will resume her North American Piece by Piece Tour on Oct. 1 at the Canadian Tire Center in Ottawa.