Stiff person syndrome is a rare neurological condition that can take years to diagnose and tailor treatment.

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Singer Celine Dion announced in an Instagram video Thursday that she is canceling some performances because she has been diagnosed with the condition.

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

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Stiff person syndrome is characterized by muscle rigidity and spasms, heightened sensitivity to stimuli such as sound and lights

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and emotional distress that can cause muscle spasms, according to the National Institute of Neurological Disorders and Stroke.

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“It frequently is associated with muscle spasms, which could be quite severe. These can cause falls, severe pain and significant disability

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said Dr. Emile Sami Moukheiber of the Stiff Person Syndrome Center at Johns Hopkins Medicine.

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“Falls from severe spasms are very common. These spasms can be precipitated by startle, severe emotions, cold weather.”

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