Billie Eilish is speaking up about her experience with Tourette’s syndrome. During an appearance with David Letterman for his Netflix series “My Next Guest Needs No Introduction,” the Grammy-winning singer discussed handling the neurological illness after suffering a tic on camera. She went on to discuss the condition with the talk show host and even answer a few questions that David had.

Let us see what she had to say.

Billie Eilish on living with Tourette’s syndrome

While chatting with Letterman, Billie Eilish began to move her head, which she said was one of her Tourette’s tics. Tourette Syndrome is a nervous system condition that causes recurrent involuntary tics, such as twitching and vocal outbursts.

“These are things you would never notice if you’re just having a conversation with me,” said the singer.

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At moments of excitement, stress, or concern, symptoms such as uncontrollable tics and spontaneous vocal outbursts become more severe. The tics don’t bother her as much when she’s “focused” on tasks like singing or horseback riding, says the ‘Happier Than Ever’ singer.

When Eilish develops a tic, people don’t always behave correctly, according to Eilish.

“The most common way that people react is they laugh because they think I’m trying to be funny. They think I’m ticcing as a funny movie. And so they go, ‘Ha.’ And I’m always left incredibly offended by that. Or they go ‘What? And then I go, I have Tourette’s,” Eilish shares with David Letterman.

Throughout the discussion show, Eilish stressed that she is not the only one having Tourette syndrome. She goes on to say that multiple celebrities have come up to her to share their experience with the condition. And it always leaves her surprised.

Eilish says, “A couple of artists came forward and said, ‘I’ve actually always had Tourette’s.’ And I’m not going to out them because they don’t want to talk about it. But that was actually really interesting to me because I was like, You do? What?”

Which episode of this year’s, My Next Guest Needs No Introduction was your favorite? Let us know in the comments.