John Mayer has cancelled his much-anticipated tour due to the return of his granuloma throat condition.

On Friday, the 34-year-old singer songwriter took to Tumblr to break the news to his fans.

I have no idea how to introduce this post, so I'm skipping the first paragraph. During rehearsal on Tuesday, it came to mind that I should see my throat doctor because something didn't feel/sound right. 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, Mayer wrote, adding that This is bad news.

The bad news comes just one week after the singer announced dates for his upcoming US tour in support of his new album, Born and Raised. Mayer had successfully gone through throat surgery to treat his granuloma in October, and the spring album release and tour were supposed to be part of his great return to the music scene, beginning with two shows in Oklahoma Mar. 15.

His last studio album, Battle Studies, was released more than two years ago.

In his Tumblr post on Friday, Mayer shared more details about his granuloma condition.

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 a**, he wrote.

When he was first diagnosed with the condition last October, Mayer also took to Tumblr to express his frustration.

I never thought I'd be wishing I could do what I love again, he wrote at the time.

In mid-February, Mayer fans were treated to Shadow Days, the first single off Born and Raised.

If the single is any indication of what the rest of the album will be like, fans are in for a new treat -- just don't expect anything to sound like Your Body Is A Wonderland anymore.

So what will Mayer do next?

Besides scheduling another surgery and a very long chemically-imposed period of silence, Mayer has no plans to push back the release of Born and Raised.

The album will drop as scheduled, on May 22, and Mayer says he's already eying the next album.

I feel really vibrant as a writer at the moment and there's no reason not to begin the next album project in the time I would have been touring, he wrote on Tumblr.

For more of John Mayer's tour cancellation announcement, visit his official Tumblr page.

Scroll down to listen to Shadow Days.