Sir Elton John was hospitalised in Los Angeles on Wednesday, after falling ill with a serious respiratory infection.
The Rocket Man checked into Cedars-Sinai Medical Center in the early hours and was subjected to a series of tests.
Sir Elton was told he needed "complete rest and antibiotic treatment to prevent damage" and doctors ordered him to take seven days off from performing.
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As a result, he's scrapped this week's upcoming shows in Las Vegas.
"All I can say to the fans is, 'Sorry I can't be with you.'"
The website reports Sir Elton has since been released from the hospital.