Billie Eilish finds having Tourette's syndrome 'exhausting'

Spend enough time with Billie Eilish and you may notice her tics. The singer talked about having Tourette's syndrome in an interview with David Letterman for his Netflix series, "My Next Guest Needs No Introduction."

The singer talked about having Tourette's syndrome in an interview with David Letterman for his Netflix series, "My Next Guest Needs No Introduction."

Eilish, who was diagnosed at the age of 11 with the neurological disorder, which can cause uncontrollable and unwanted vocalization and/or repetitive movements, said people sometimes misunderstand what is happening.