Global superstar Celine Dion has pushed back her Spring 2023 concerts and several European tour dates after revealing Thursday that she has stiff-person syndrome, a rare neurological disorder that prevents her from singing the way she’s used to.

The five-time Grammy Award-winning musician, 54, shared her diagnosis addressing her fans — delivered on Instagram in English and in French — and began each with an apology “for taking so long to reach out.” She told them that she’s ready to share her story, which is dramatically affecting her Courage World Tour.

“I’ve been dealing with problems with my health for a long time and it’s been really difficult for me to face these challenges and to talk about everything that I’ve been going through,” Dion said.