Miley Cyrus has heart condition, which is called tachycardia. She explained her heart condition, “The type of tachycardia I have isn't dangerous. It won't hurt me, but it does bother me. There is never a time onstage when I'm not thinking about my heart.
During her 2009 Miles To Go memoir, she admitted that she need be careful with her health.
She wrote in the book, 'My heart rate increases a lot just from going up a flight of stairs. There is never a time onstage when I'm not thinking about my heart.' She also admitted she was born with a hole in her heart.