John Mayer announced Friday that he is canceling his 21-city tour because of a recurring vocal cord issue.
"During rehearsal on Tuesday, it came to mind that I should see my throat doctor because something didn't feel/sound right," Mayer wrote on Tumblr.
"I went in for a visit on Wednesday and a scope of my vocal cords revealed that the granuloma has grown back where it had mostly healed. This is bad news. Because of this, I have no choice but to take an indefinite break from live performing. Though there will be a day when all of this will be behind me, it will sideline me for a longer period of time than I care to have you count down."
Meyer, 34, was scheduled to embark on a 21-city tour to celebrate the release of his fifth studio album, "Born and Raised." The singer the album still will be released on May 22, and that he'll begin writing his next album while he tends to the vocal cord problems.
"Somewhere in all of this is another surgery and a very long chemically-imposed period of silence," he continued. "So I hope you'll understand that I have to really pick that date (to resume performing) carefully."
The first single from "Born and Raised" -- "Shadow Days" -- was released this week, and is among the top 10 bestselling singles on iTunes.
Mayer underwent surgery to remove a granuloma on his vocal cords in October. His fellow Grammy winner Adele underwent the same surgery last year, and said in a Vogue interview that Mayer had reached out to her to offer his support at the time.
"I want to explain this a bit more in depth than I have in the past, because I know there's some confusion as to what this condition is," Mayer wrote at Tumblr. "A granuloma forms and continues to snowball because it's in a spot where the vocal cords hit together and there's no way to really give it a chance to heal without a good stretch of time and some pretty intensive treatment. In short, it's one giant pain in the ass."