Celine Dion will no longer sing. Her condition is worsening, and she can no longer leave her home.

For some time now, she has been battling with the debilitating ‘stiff person syndrome.’

The 55-year-old is now so weakened that she hates to leave her house, even for a short period, and has no plans to return to her tour, the dates of which she canceled in May.

A few weeks ago, the star’s sister, Claudette, revealed in an interview that Celine was trying to find effective treatments for her rare autoimmune disease:

“She is disciplined in every aspect of her life. We’re not finding any medication that works, but it’s crucial to keep hope alive.”

Dion’s rare disease, among other things, causes seizures, involuntary movements of facial or limb muscles, and heightened sensitivity to noise and touch. Science has not yet identified the exact causes, but early studies indicate it’s an autoimmune condition.

Most people who develop this disease are diagnosed between the ages of 40 and 60.

Currently, there is no cure for SPS, which can leave sufferers unable to walk or speak. In most cases, people with SPS respond to high doses of diazepam, often used as an anti-anxiety medication.”