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CNN reports renowned pop star Billie Eilish opened up about her tics. In a recent interview with David Letterman, Eilish was candid about her struggle with Tourette's syndrome. Eilish was diagnosed with the neurological disorder at the age of 11, which causes uncontrollable vocalization and repetitive movements. Eilish says those unaware of her disorder often misunderstand what is happening. "The most common way that people react is they laugh because they think I'm trying to be funny. " Billie Eilish, in an interview with David Letterman, via CNN.