Céline Dion was diagnosed with stiff-person syndrome. Here's how it affects people

Céline Dion performing in 2019, the year her world tour was original scheduled to begin. It has since been delayed repeatedly, first due to the pandemic and then because of muscle spasms that have now been diagnosed as stiff-person syndrome. (Rich Fury/Getty Images for NARAS)

The singer Céline Dion announced she finally has a diagnosis for the medical condition that has caused her to cancel and postpone performances over the past year.

In a tearful social media post Wednesday, the "My Heart Will Go On" singer said she's been suffering from stiff-person syndrome, a rare and incurable neurological condition that causes severe muscle spasms and stiffening in the limbs.