Celine Dion Has Lost Control of Her Muscles, , Her Sister Confirms.br Dion was diagnosed with a rare neurological condition known as Stiff-Person Syndrome last year.br In a new interview with '7 Jours,' Dion's sister, Claudette, shared an update about the singer's health, according to 'The Hollywood Reporter.'.br She said that Dion "is working hard br [to battle through her disorder], but she br doesn’t have control of her muscles." .br What pains me is that she’s always been br disciplined. She’s always worked hard. br Mom always said to her: ‘You will do well, br you will do things as they should be done.’ , Claudette Dion, via '7Jours'.br There’s no doubt that in our dreams br and in hers, the idea is to come back to br the stage. In which state? I don’t know. , Claudette Dion, via '7Jours'.br The vocal cords are muscles, br and the heart is also a muscle, Claudette Dion, via '7Jours'.br Claudette went on to say that science hasn't found a way to treat the condition yet.br That’s what is so upsetting to me. br Since these cases are one in a million, br scientists have not done that much research br since it doesn’t affect that many people, Claudette Dion, via '7Jours'.br You know how people often jump br up in the night because of a cramp in br the leg or the calf? It’s a bit like that, br but in all muscles.