Celine Dion revealed Thursday that she has been diagnosed with a rare and incurable neurological disease called Stiff Person Syndrome (SPS).

The 54-year-old singer uploaded a video on Instagram Thursday, telling her fans about her diagnosis of SPS which would cause muscle stiffness and muscle spasms. It’s so rare that it affects only about one to two people per million.

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“I’ve been dealing with problems with my health for a long time, and it’s been really difficult for me to face these challenges and to talk about everything that I’ve been going through,” she said. “Recently I’ve been diagnosed with a very rare neurological disorder called the stiff person syndrome which affects something like one in a million people.”

“While we’re still learning about this rare condition, we now know this is what’s been causing all of the spasms I’ve been having,” she continued. “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.”

She said she wouldn’t be able to the tour in Europe in February and decided to postpone tour dates.

Dion has recently denied rumors that she’s starving herself after photos showed a shocking weight loss.

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