Cyrus canceled her Tuesday night concert at the Sprint Center after she was hospitalized for what her managers described as a "severe allergic reaction to antibiotics."
"Cyrus has been hospitalized for a severe allergic reaction to antibiotics and has been placed on medical rest by her doctors. She will not be able to perform as scheduled," the Sprint Center said in a statement.
Ticket-holders will be able to get their money back.
The "We Can't Stop" singer has felt ill in recent days.
"Why is this cough coming back #sorethroat #feelingnobueno," she tweeted Monday.
"Fever fever go away," she added.
Cyrus apologized to her fans for canceling her gig.
"I wanted so badly 2 b there 2night. Not being with yall makes me feel shittier than I already do," she tweeted, then added a photo of herself in the hospital.
Mr. Octopussy & some amazing Drs are taking good care of me pic.twitter.com/7FJFxYa7M5— Miley Ray Cyrus (@MileyCyrus) April 15, 2014
[Kansas City Star, E! News]