Miley suffering from a heart condition

MILEY CYRUS has revealed that she has a condition that speeds up her heart beat.

The teenage singer said she suffers from tachycardia, meaning that her heart rate exceeds the range of a normal resting heart rate. "

The 16-year-old revealed the condition in her new autobiography, 'Miles to Go' and said: "The type of tachycardia I have isn't dangerous. It won't hurt me."

But she admitted that it does bother her and plays a huge part in her life, especially when she's performing

She said: "There is never a time onstage when I'm not thinking about my heart."

The Hannah Montana star also hoped she was a wholesome influence for her fans.

She said. “I try to be a good role model and that’s why I think it’s too bad that lots of people hope to make money off my mistakes.”