Last week (12Aug09) the Hero hitmaker scrapped an upcoming appearance at a televised concert in New York, leaving teen star Miley Cyrus to fill in for her.
She has also postponed the release of her new album Memoirs Of An Imperfect Angel for a second time, which was initially slated to hit stores on 25 August (09) but now won't get a release until the end of September (09).
The news has sparked fears for Carey's heath, with internet gossips suggesting the star may have fallen ill.
But a representative for the singer is adamant the delays are noting to worry about.
Carey's publicist Cindi Berger tells People.com, "These dates have been postponed and not cancelled. Record release dates change all the time. It's nothing unusual and it doesn't signal anything. There are a lot of moving parts to Mariah's professional life. It's no big deal."