In a statement, they said: "John Mayer is recovering from the emergency appendectomy he underwent yesterday and is in good spirits."
John previously confessed he expects too much of himself at times.
He said: "The reason I'm so happy now is because a lot of expectation that I had for myself was probably a little bit unnecessary. I have a perfect image of ambition and reward for my life right now. I know what to expect, I know how much I should be asking for when I knock on the door, and I get it.
"I really write down on a piece of paper what I want out of life and what I want out of work and what I want out of "fame" - and I have all the stuff I want. And, yeah, I would probably like another 10, 15, 20%, but that comes with another 85% of headache.
"That's the truth. It would take another 85% of my happiness to get another 15% to 20% famous and, like, culturally relevant or whatever."
-Bang! Showbiz