Celine Dion's return to the stage underscored a remarkable comeback after stiff-person syndrome, an incurable condition that causes stiffness and cramps, forced her to cancel shows and cast years of uncertainty over whether she would ever perform again.
Source: [CBS News](https://www.cbsnews.com/news/celine-dion-first-concert-in-6-years-rare-neurological-disorder-stiff-person-syndrome/)