In the new documentary "I Am: Celine Dion," world-renowned singer Celine Dion bravely shares a raw and vulnerable moment of her experience living with stiff-person syndrome. The film, released on Prime Video, captures a scene of Dion suffering a severe spasm during a physical therapy session, shedding light on the rare neurological disease she was diagnosed with in December 2022. The footage shows Dion freezing, crying, and shaking in pain as she goes through one of these challenging moments. The documentary also explores the symptoms and treatments for stiff-person syndrome, which affects only one or two out of every 1 million people. Dion's physician, Dr. Amanda Piquet, explains the scene as a whole-body spasm triggered by anxiety and panic. Viewers witness Dion's struggle with embarrassment and loss of control, shedding light on the daily challenges she faces living with this debilitating condition.