The music star talked about having Tourette's Syndrome during an interview with David Letterman
for his Netflix series, "The Next Guest Needs No Introduction."
Billie, who was diagnosed at age 11 with the neurological disorder, which can cause uncontrollable
and unwanted vocalizations and/or repetitive movements, said that people sometimes don't understand what's going on.
"The most common way people react is to laugh because they think I'm trying to be funny," she said. "And I'm always incredibly offended."
The Grammy winner said that other artists have shared with her that they also have
Tourette's syndrome, but said she "wouldn't divulge them because they don't want to talk about it."
She said that while some of her tics have diminished, she still has some subtle ones.
"These are things you would never notice if you were just talking to me," Eilish said. "But for me they are very tiring."
Billie is happy to talk about it because it is "interesting" to her, who also revealed that she doesn't have tics while she is performing.
"When I'm moving, I'm not even ticking," she joked.