Celine Dion revealed in 2022 that she had been diagnosed with the rare and incurable disorder stiff-person syndrome (SPS), forcing her to cancel a planned world tour. Little is known about the disease, which affects just one or two out of every million people. Its symptoms are painful and debilitating, and while treatment is available to lessen the impact SPS has on the mind and body, there is currently no cure for this condition that causes stiffening in the torso and limbs, along with episodes of severe muscle spasms.
But what causes stiff-person syndrome, and how is it treated? Click through to learn about the disease and its most famous victim.