86-year-old singer posts apology, says he need to have his doctor check it out

Willie Nelson has come off his tour because of a “breathing problem”.
The 86-year-old singer apologised on Twitter late Wednesday, writing “I need to have my doctor check out.” Nelson had just finished performing with Alison Krauss in Toledo, Ohio, and he was next scheduled to appear Friday in Grand Rapids, Michigan.
He wrote “I’ll be back.”
Farm Aid says Nelson will resume his tour September 6.