Billie Eilish is opening up about what it’s like with living with Tourette’s syndrome.

“If you film me for long enough, you’re gonna see lots of tics,” Eilish told Letterman.

Eilish, who was diagnosed at age 11, said that people who aren’t aware she has Tourette’s often don’t recognize her tics during social interactions and respond insensitively to them.

“What’s funny is so many people have it that you would never know,” Eilish said.