Heartthrob singer Billie Eilish was diagnosed with Tourette Syndrome at the age of 11. The Grammy Award winner, 20, acknowledged the neurological disorder as she had a tic while appearing recently on David Letterman's Netflix talk show, My Next Guest Needs No Introduction.
Tourette Syndrome is a condition of the nervous system that causes recurrent involuntary tics, which are repeated, involuntary physical movements such as twitches and vocal outbursts. The most frequent forms of tics involve blinking, sniffing, grunting, throat clearing, grimacing, shoulder movements and head movements.
