A publicist for Nelson says shows scheduled this week in Rohnert Park, California; Las Vegas; and Laughlin, Nevada, have been canceled. The San Diego Union-Tribune reported that Nelson left his show at a San Diego casino on Saturday after the first song, "Whiskey River."
Fans told the newspaper that Nelson was coughing and apparently had difficulty breathing. A statement from Ticketmaster said he left the stage early because of an illness.
Nelson, 84, keeps up a rigorous touring and recording schedule. His latest album, "Willie Nelson and the Boys: Willie's Stash Vol. 2" featuring his sons Lukas and Micah was released last year.