American actor

Ashton Kutcher

has been battling

vasculitis

, a rare autoimmune disease, that affected his

vision

,

hearing

and sense of

balance

for a year .

This is how the protagonist of No strings attached recognizes it

in

a video broadcast by the

Access Hollywood

medium , which specializes in celebrity news.

The American media published this confession in an exclusive preview of an upcoming episode of

Running Wild with Bear Grylls: The Challenge

, a

National Geographic

program , where the actor spoke and in which he spoke about

the "rare autoimmune disorder he developed"

.

"About two years ago, I had this strange and super rare form of vasculitis, which took away my vision, took away my hearing, took away my balance," the actor revealed to adventurer

Bear Grylls

, host of the show.

It took him about a year to build each of his senses back up, he explained.

Vasculitis is a

rare

autoimmune disorder with many variations that can cause inflammation of the blood vessels, restricting blood flow and leading to organ and tissue damage.

The actor

feels lucky to be alive

, and despite the experience, Ashton doesn't let that, or any of life's challenges, bring him down.

Instead, he sees them as opportunities for growth, he says in the

Access Hollywood

video .

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