Sprint Center officials say Cyrus was hospitalized for a severe allergic reaction to antibiotics.
On her Twitter account, Cyrus said, "Kansas I promise Im as (heartbroken) as you are. I wanted so badly 2 b there 2night. (crying face). Not being with y'all makes me feel (expletive) than I already do."
TMZ.com said Cyrus had been shopping in Kansas City with her mother earlier in the day.
Sprint Center officials said refunds for Tuesday's concert can be made where tickets were purchased.
(KCTV contributed to this report)
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