The 54-year-old music icon explained how the illness has made it difficult for her to sing and walk, which means she won’t be able to perform at scheduled concerts in the United Kingdom and Europe next year.
Dion took to her Instagram page to reveal the news to her fans, saying: “I know you might have questions about my health and I wanted to let you know that I am doing great.”
“I’ve been dealing with problems with my health for a long time,” Dion said.
“And it’s been really difficult for me to face these challenges and to talk about everything that I’ve been going through,” she continued in the emotionally-charged video.
“Recently I’ve been diagnosed with a very rare neurological disorder called the stiff person syndrome which affects one in a million people.
While we’re still learning about this rare condition, we now know this is what’s been causing all the spasms I’ve been having.”
She added: “Unfortunately, these spasms affect every aspect of my daily life, sometimes causing difficulties when I walk and not allowing me to use my vocal cords to sing the way I’m used to.
“It hurts me to tell you today that this means I won’t be ready to restart my tour in Europe in February”.
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Fans and followers have since taken to social media to render their support for the singer. Recall the singer lost her husband and brother to cancer in the space of one month in 2016.