The Newsroom actress confessed that she battles anxiety and suffers from a condition known as trichotillomania.
"I don't bite my nails, but I rip out my eyelashes," Munn explained in an interview with The New York Daily News.
"It doesn't hurt, but it's really annoying. Every time I run out of the house, I have to stop and pick up a whole set of fake eyelashes."
Munn went on to say that while she does battle anxiety, she still considers herself to be a strong woman.
"I don't think anyone would describe me as weak, but I don't want people to be mean to me," she added. "As an Air Force kid, I moved around a lot when I was younger and no-one was nice to the new kid. So there is always this feeling that someone will make fun of me."
Munn recently praised her Newsroom character for being 'both smart and sexy'.