What is stiff-person syndrome? Céline Dion dropped an emotional video to fans Thursday, revealing that she’s been diagnosed with the rare neurological condition called stiff-person syndrome. “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,” Dion said. According to information from Johns Hopkins Medicine in the United States, stiff-person syndrome is a very rare cond

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