Ashton Kutcher has opened up about his secret health battle which left him feeling "lucky to be alive".

The Two and a Half Men star, 44, gave an insight into the horrific symptoms he suffered in the past due to his autoimmune disorder, which left him unable to see, hear or walk.

In a preview for an upcoming episode of Running Wild with Bear Grylls: The Challenge, dad-of-two Ashton revealed that he had a "super rare form" of vasculitis around two years ago.

"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," the actor said in the clip, which was shared by Access Hollywood.

Vasculitis involves the inflammation of the blood vessels, with the immune system attacking healthy blood vessels and causing them to become swollen and narrow, as stated on the NHS website.

If blood flow is restricted, then organ and tissue damage can potentially occur. There are various different types of vasculitis with the majority being rare.

Ashton went on to add that it took him "like a year" to build his strength back up following the health battle, and explained that he now has a newfound appreciation for his health.

"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.'"

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The star, who shares daughter Wyatt, seven, and five year old son Dimitri with his actress wife Mila Kunis, 38, also said he feels "lucky to be alive".

Bear Grylls, 48, then praised Ashton's ''strength through adversity" as the actor outlined his positive outlook on life.

"The minute you start seeing your obstacles as things that are made for you, to give you what you need, then life starts to get fun, right? You start surfing on top of your problems instead of living underneath them," Ashton said.

He has not stated when his medical issues first began and tends to keep his personal life out of the spotlight, with him and Mila keeping a relatively low profile over recent years and rarely sharing posts on social media.

Ashton and Mila both starred in That '70s Show together but didn't start dating until 2012. They announced their engagement in February 2014 and Mila gave birth to the couple's first child later that same year.

Mila and Ashton went on to tie the knot in 2015 and welcomed their second child the following year. The famous family now reside in a sustainable farmhouse out in Beverley Hills, where they enjoy a quiet life.

Running Wild with Bear Grylls: The Challenge featuring Ashton Kutcher will be release on National Geographic on Monday 8 August.

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