NEW YORK — Pop superstar Celine Dion announced Thursday (Dec 8) that she is canceling and rescheduling her planned 2023 tour dates after being diagnosed with stiff-person syndrome, a rare neurological condition.

The syndrome, which causes progressive stiffness in the body and severe muscle spasms, is “exquisitely rare” and affects perhaps one in a million people, according to Dr Pavan Tankha, the medical director of comprehensive pain recovery at Cleveland Clinic.