Kutcher shared that roughly two years before the episode aired, he was diagnosed with a "weird, super-rare form of ". Vasculitis is a condition where the immune system mistakenly attacks the body's own blood vessels, causing inflammation that can restrict blood flow and lead to organ and tissue damage.

The Hidden Battle: How Ashton Kutcher Lost His Senses for a Year

The impact on Kutcher’s life was immediate and devastating: