John Mayer is known for opening his mouth at times, but now the 'Who Says' singer is going to have to quiet down a bit. He revealed via a post on his Tumblr page that he has to cancel his upcoming iHeartRadio festival appearance and his Los Angeles gig with Tony Bennett due to a case of ganuloma, which is a vocal chord inflammation.

Mayer, 33, also said that he has to push back the release of 'Born and Raised,' his next album. He had hoped for a 2011 release, but that's not feasible now as he can't complete some of the unfinished vocal parts till his larynx heals. Only time will tell when we "hear" from John Mayer again. Maybe he'll return to tweeting since he can't sing for a bit.

Below is the text of Mayer's post to fans:

Hi everyone,
After several months of going week to week monitoring and hoping to correct the condition, I am forced to cancel my upcoming singing engagements due to something next to my vocal cords called a granuloma.
I’m bummed to have to bow out of both the iheartradio Music Festival in Las Vegas and an appearance with Tony Bennett in Los Angeles. I know there were people depending on me to be there and I’m sorry that I can’t be on those stages.
‘Born and Raised’ is complete as far as music recording, song selection, and in some cases mixing, but because of this condition I couldn’t finish singing on several of the tracks. This means the record will be released next year instead of this fall or winter.
This is a temporary setback, though I’m not sure how long or short a period of time it will be. I’ve got the best doctors in the country looking after me and I will be singing and touring again as soon as I get the all clear. Until then I’ll be spending time writing and composing more music and kicking an empty soup can around the West Village.
I’m looking forward to seeing you again soon. Until then take good care.