Miley Cyrus struggling with stomach flu

Singer Miley Cyrus is struggling with rehearsals for her upcoming world tour after coming down with stomach flu.

The pop star will kick off her Bangerz world tour in Canada on Valentine's Day (14Feb14), but run-throughs for the show have been thrown into jeopardy after the singer came down with a nasty bug.

Cyrus has detailed her health battle in a series of posts on Twitter.com, writing, "Up all night to get pukey" before later adding, "I have the worst stomach flu of all time... Regretting all the times I wanted to be grown up as a kid. Someone baby me... everything hurts."

The tour kicks off in Vancouver, Canada.