How is the disease that Michael J. Fox has?, Dr. Elmer Huerta explains the symptoms 7:33

(CNN) — Actor Michael J. Fox was participating in a panel discussion on "Back to the future" on Sunday when he suffered a fall.

Fox was at the Pennsylvania Convention Center in Philadelphia for a question-and-answer session about the film. When he was introduced and bowed he lost his balance, falling and crashing into a sofa.

Fox was diagnosed with Parkinson's disease at age 29, in 1991. This disease can affect balance.

His co-stars Christopher Lloyd and Tom Wilson were also on stage.

• What is Parkinson's disease?

Fox recently stated that his battle with Parkinson's has become more difficult. "I'm not going to turn 80," he told "CBS Sunday Morning."

He added: "I'm not going to lie. It's getting hard, it's getting very hard. Every day is more difficult. It's harder every day."

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In 2000, the Family Ties alumnus created the Michael J. Fox Foundation for Parkinson's Research, which has raised more than $1 billion in funding.

His documentary, "Still: A Michael J. Fox Movie," is available on Apple TV+.

Back to the FutureMichael J. Fox