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Ashton Kutcher recently had a serious medical scare after a rare illness left him unable to see, hear or walk.
It's a disease which causes the walls of the blood vessels to thicken, reducing or cutting off the supply of blood to organs around the body which poses a serious risk to health and wellbeing.
Kutcher revealed all during his time on Running Wild with Bear Grylls: The Challenge, where he opened up about a battle with an autoimmune disease two years ago.
The pair were hiking through the Costa Rican jungle for Kutcher's episode of the show when the actor made the revelation.
The star said he was 'lucky to be alive' after his encounter with the disease, telling Grylls how rare the disease he was struck down with was and what it did to him.
He said: "I had this weird, super rare form of vasculitis that knocked out my vision, it knocked out my hearing, it knocked out like all my equilibrium.
"It took me about a year to build it all back up. You don’t really appreciate it until it’s gone.
"Until you go, 'I don't know if I'm ever going to be able to see again, I don't know if I’m ever going to be able to hear again, I don’t know if I’m ever going to be able to walk again.'"
Running Wild with Bear Grylls takes celebrities on a 48 hour journey with Bear Grylls through difficult conditions where they have to push themselves.
There have been a whole host of famous guests on the show, including a special episode starring then-US president Barack Obama.
Beyond appearing on Running Wild with Bear Grylls, Kutcher has this year been working with wife Mila Kunis to raise money in support of Ukrainian refugees.
The couple raised more than $35 million worth of donations to help Ukrainians forced to flee their home country in the face of Vladimir Putin's brutal invasion.
Kutcher and Kunis were thanked personally by Ukrainian president Volodymyr Zelenskyy, who praised them as being 'among the first to respond to our grief' in the face of Russian aggression.
Ashton Kutcher's episode of Running Wild with Bear Grylls: The Challenge will be premiering tonight (8 August) on National Geographic, further episodes in the series will feature appearances by Florence Pugh, Anthony Anderson and Rob Riggle.
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