Miley Cyrus is battling strep throat as she crisscrosses the U.S. two weeks into her “Wonder World Tour.”

“Strep is the worst thing ever,” she Tweeted on Tuesday. “why am I always sick?” she later added.

The star had to leave the stage during a performance of “7 Things” in Salt Lake City on Tuesday night, according to The Salt Lake Tribune. Miley, 16, reportedly receiving medical attention before returning to the stage after 15 minutes and completing her 70-minute live performance.