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Celine Dion
Christopher Polk/Billboard via Getty Images

Friday was International Stiff Person Awareness Day, and Celine Dion, who was diagnosed with the autoimmune disorder in 2022, took to social media to share an inspiring message.

Stiff person syndrome is a rare autoimmune disorder that causes muscle stiffness and spasms and sometimes unsteady gait, double vision or slurred speech.

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