Celine Dion is the best-known sufferer of this disorder, one of many autoimmune illnesses that disproportionately impact women.

Adam Devine had a devastating accident when he was a kid and is still dealing with the fallout. But a recent diagnosis of stiff person syndrome was off the mark.

Stiff person syndrome is an extremely rare disorder that makes the muscles in the torso and limbs alternate between spasming and being rigid. Estimates suggest it affects around 70 people in the ...

The actor, known for his roles in “Pitch Perfect” and “Modern Family,” was told he had Stiff Person Syndrome — a rare neurological disorder — that would cut years off his life.