Add Yahoo as a preferred source to see more of our stories on Google. Many of us have felt a muscle in some part of our body suddenly and involuntarily tighten, causing a twitch or even severe cramp.

Céline Dion revealed that she's been diagnosed with stiff person syndrome on Thursday. Stiff person syndrome is a very rare neurological disorder that causes progressive muscle stiffness and painful ...

The singer said she's been diagnosed with a neurological disorder called stiff person syndrome in an emotional Instagram video Thursday. The singer said the symptoms are what have been causing her to ...

World-renowned singer Celine Dion shared a vulnerable moment of her experience with stiff-person syndrome in a raw scene in the new documentary, “I Am: Celine Dion.” The film, released Tuesday on ...

Céline Dion's rare neurological disorder, stiff person syndrome, is the focus of her new documentary “I Am: Céline Dion,” released on Prime Video in late June. To create the film, the music legend ...