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Ashton Kutcher has provided a fan health update after it was revealed in a trailer for an upcoming episode of Running Wild with Bear Grylls: The Challenge that he was battling a rare autoimmune disease.

“Before, there’s a bunch of rumours/gossip/whatever out there. Yes, I had an episode of rare vasculitis 3 years ago. (autoimmune flair in place),” Kutcher tweeted on Monday, August 8. “I had issues with hearing, vision, balance right after. I completely recovered. All good. Let’s move on. See you at the 2022 New York City Marathon with Thorn.

The two and a half men alum was responding to the reveal of the Run wild teaser, which had been released earlier on Monday. In the clip, Kutcher tells Grylls he was “lucky to be alive” after suffering from a rare form of vasculitis.

“Like two years ago I had this weird, super rare form of vasculitis that, like, destroyed my vision, it destroyed my hearing, it destroyed, like, all my balance,” the That 70s show star explained. “You don’t really appreciate him until he’s gone. Until you go, ‘I don’t know if I’ll ever be able to see again, I don’t know if I’ll ever be able to hear again, I don’t know if I’ll ever be able to walk again.'”

According to LWW reviews, “Vasculitis is a rare and life-threatening inflammation of blood vessels that causes constriction or occlusion, ultimately limiting blood supply to tissues or organ systems.”

Kutcher, who descended from a 300-foot cliff in the Costa Rican jungle in the new Run wild episode, added: “As soon as you start to see your obstacles as things made for you, to give you what you need, then life starts to become fun, right? You start surfing your problems instead of living under them.

Running Wild with Bear Grylls: The Challenge, Monday, 9/8c, National Geographic