United Kingdom, Nov. 3 -- Reese Witherspoon says her anxiety fuelled her career success.

The 49-year-old actress says the mental health disorder - which causes abnormal fear and dread - made her become a perfectionist in her illustrious career, which spans over three decades.

Appearing on one of a suite of covers for Harper's Bazaar UK's December/January issue, Reese explained: "I was probably successful because I had so much anxiety. They go hand in hand.

"I had pressured myself to extreme levels to show up at work in a perfect way. We all now know - perfect is not attainable. It's not sustainable. I stressed myself out in service of my job, and it got me really, really far. I'm rewarded for my anxiety and perfectionism.

"But I'm get...