What is stiff-person syndrome, the neurological disorder afflicting Celine Dion?

Canadian singer Celine Dion, seen here during one of her performances in Paris, France, says she's doing everything she can to recuperate from the syndrome. — AFP

Celine Dion revealed on Thursday that she is suffering from a rare neurological disorder called stiff-person syndrome (SPS) that is affecting her everyday life.

The iconic singer announced the news in a video posted on social media and said she has postponed her 2023 tour.