Celine Dion has canceled all of her scheduled tour dates through April 2024 as she continues treatment for a rare neurological disorder.

“I’m so sorry to disappoint you all once again,” the singer said in a statement on social media. “I’m working very hard to regain my strength, but touring can be very difficult even when you’re at 100%. It’s not fair for you to keep postponing shows, and even though it breaks my heart, we better cancel everything now until I’m really ready to get back on stage.”

Dion has canceled a total of 42 European dates, including stops in the Netherlands, France, Belgium, Denmark, Norway, Sweden, Finland, Poland, Czech Republic, Switzerland, Croatia, in Germany, Hungary, Austria, England, Scotland and Ireland.

Earlier this year, Dion said stiff-person syndrome caused him to have spasms that affected his ability to walk and sing.

“Unfortunately, the spasms affect all aspects of my daily life, sometimes making it difficult for me to walk and not allowing me to use my vocal cords to sing as I normally do,” she said.

Stiff-person syndrome causes stiff muscles and painful muscle spasms, which can be triggered by things like loud noises or light touches. The cause is unknown, but it is thought to be an autoimmune disease. Severe cases can lead to difficulty walking and a hunched posture.

Dion, who has won five Grammys and two Oscars, counts songs like “I’m Alive” and “My Heart Will Go On” among his hits.