Actor Ashton Kutcher revealed that he previously suffered from a rare autoimmune disorder that left him unable to see, hear or walk.

The 44-year-old actor opened up about his recent health challenges in an upcoming episode of National Geographic’s “Running Wild with Bear Grylls: The Challenge,” according to “Access Hollywood.”

“Like two years ago, I had this weird, super rare form of vasculitis, that like, knocked out my vision, it knocked out my hearing, it knocked out, like, all my equilibrium,” Kutcher explained. “It took me like a year to build it all back up.”

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“You don’t really appreciate it, until it’s gone,” he added. “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.’”

Read more: Daily Wire