For years, Céline Dion was living with symptoms she could not fully explain.

Long before she publicly revealed that she had stiff-person syndrome, the superstar was already experiencing signs of the rare neurological condition — a struggle she now says stretched back roughly 17 years before she finally received a diagnosis in August 2022.

The revelation adds a new dimension to Dion’s health journey. What eventually became a public battle involving canceled performances, difficulty walking and an uncertain future onstage had actually been developing quietly for much of her adult life.

Now 58, Dion is looking back at just how long she lived without knowing what was happening to her body.

At its worst, the pain became severe enough that walking was difficult. She also disclosed that there were periods when she relied on high doses of Valium simply to make it through ordinary daily life.

Yet even as the condition increasingly affected her, Dion continued doing what had defined her career for decades: performing.

That became harder to sustain.

Between 2021 and 2022, she canceled a number of scheduled appearances as health problems interfered with her ability to work. Then, in December 2022, Dion publicly revealed what doctors had finally determined months earlier: she had stiff-person syndrome.

The diagnosis gave a name to symptoms she had been experiencing for nearly two decades.

Stiff-person syndrome is extremely rare. The condition can involve intense muscle stiffness, painful spasms and other symptoms capable of dramatically limiting movement. According to information cited in Dion’s recent profile, it affects approximately one person in a million.

For Dion, however, the medical terminology tells only part of the story.

The larger struggle was learning how to live inside a body that was no longer responding the way it once had.

She describes the illness as progressive, though she prefers calling it a “condition” rather than a disease. The distinction appears small, but it reflects the way Dion has approached the diagnosis: as something serious that has changed her life, but not something she intends to allow to define everything about it.

Her greatest concern was not always her career.

It was her children.

Dion is the mother of three sons: René-Charles, 25, and 15-year-old twins Nelson and Eddy. Their father, Dion’s longtime husband and manager René Angélil, died in 2016.

As Dion’s physical condition became more visible at home, she realized her sons were beginning to notice.

At one stage, she said she could barely walk. She was also deeply missing the experience of simply living as she once had.

Seeing her children become aware of those changes forced her to confront another fear: they had already lost their father, and she did not want them wondering whether they might lose their mother too.

So Dion spoke to them directly.

She explained that although she had a serious condition, it was different from what had happened to their father. Her message to them was ultimately one of reassurance: she intended to learn how to live with it.

That determination eventually became visible to the world.

After spending years away from major performances, Dion made an emotional return during the opening ceremony of the Paris Olympics in July 2024.

Standing at the base of the Eiffel Tower, she performed publicly for the first time since revealing her diagnosis.

It was more than another appearance by one of pop music’s most recognizable voices.

After the cancellations, the diagnosis and the uncertainty surrounding whether she would be able to sing onstage again, the moment represented a return to a part of herself that stiff-person syndrome had threatened to take away.

Several months later, in November 2024, Dion performed again, this time at the 1001 Seasons of Elie Saab fashion event in Riyadh, Saudi Arabia.

Her story had also become increasingly public by then.

In June 2024, the documentary I Am: Céline Dion offered viewers a closer look at her experience with stiff-person syndrome and the difficult reality behind her efforts to return to performing.

But Dion’s comeback is no longer limited to isolated appearances.

She has announced plans for a series of Paris performances beginning in September 2026 and continuing through May 2027. She explained that after being separated from audiences for so long, she wanted to give fans something that could express just how much she had missed them.

The decision carries added significance in light of what she has now revealed about the timeline of her symptoms.

Her health battle did not suddenly begin when concerts started disappearing from her schedule.

It did not begin when she made the emotional announcement about her diagnosis.

And it did not begin when audiences saw the physical toll of the condition in her documentary.

According to Dion, the first chapter began approximately 17 years before doctors finally identified what she was facing.

That means many years of her career unfolded while something unexplained was already happening behind the scenes.

Today, Dion is speaking about the future with excitement rather than retreat.

In a message marking her 58th birthday in March 2026, she said she felt strong, healthy enough to move forward and eager to see her audience again.

There is no suggestion that the condition has simply disappeared. Dion herself has described it as progressive.

Instead, her return represents something different: learning how to continue despite it.

After 17 years of symptoms, a diagnosis that changed the direction of her life and a period when even walking became difficult, Dion is preparing to stand before an audience again.

For a performer whose voice has filled arenas for decades, returning to the stage may now carry a meaning far beyond another concert.

It is a way of reclaiming something she feared she might have lost.