HANNAH MONTANA star Miley Cyrus is suffering from a heart condition.
The pop star/actress reveals in her autobiography Miles to Go that she has tachycardia, meaning her heart rate exceeds the range of a normal resting heart rate.
And although the condition isnt life-threatening, Cyrus admits she struggles to deal with the issue.
She writes, "The type of tachycardia I have isnt dangerous. It wont hurt me, but it does bother me. There is never a time onstage when Im not thinking about my heart."