In this file photo taken on June 24, 2016, Celine Dion performs on stage at the AccorHotels Arena concert hall in Paris.  She had to delay her tour because of stiff-person syndrome.

What is Celine Dion’s stiff person syndrome?

Earlier this month, singer Celine Dion posted on Instagram that she has stiff person syndrome. “We now know that’s what caused all the spasms I had,” she said. She went on to say that it affected all aspects of her daily life, including when she walked and her ability to sing and control her vocal …

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