Willie Nelson, the 86-year-old country music icon, announced on social media on Wednesday night that he is canceling his tour due to a breathing problem.

On Twitter, he said: “To my fans, I’m sorry to cancel my tour, but I have a breathing problem that I need to have my doctor check out. I’ll be back, love, Willie.”

To my fans,
I’m sorry to cancel my tour, but I have a breathing problem that I need to have my doctor check out.
I’ll be back
Love,
Willie

— Willie Nelson (@WillieNelson)August 8, 2019

Nelson and fellow country artist Alison Krauss had been scheduled to perform in Toledo, Ohio, on Wednesday night. Nelson didn't clarify the total number of dates canceled, but according to his website, the tour included dates in Michigan, West Virginia, South Carolina, Virginia and North Carolina. The singer's website also lists upcoming dates of the Outlaw Music Festival in New Hampshire, New York, Pennsylvania, Virginia, North Carolina, Tennessee, Indiana, Wisconsin and Ohio. Nelson's tour dates also include a six-night run at the Venetian in Las Vegas in October.

Illness has sidelined the legendary musician before — in 2018 he had to cancel a run of January and February shows.