Willie Nelson has canceled his upcoming tour dates as he seeks treatment for a “breathing problem.”

Willie, 86, delivered the news via Twitter on Aug. 7, stating: “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

Willie has six more shows scheduled in August, as well as 11 in September, 10 in October and three in November. There’s no word yet on the exact number of canceled dates.

Over the past few years, the perpetually-touring Willie has been forced to cancel a handful of shows due to illness, including dates in November 2016, January 2017, February 2017, August 2017 and February 2018.