The 27-year-old was nominated for an Oscar and a Golden Globe for her role in the 2009 movie "Up in the Air", reported Contactmusic.
"It was a lot of fun but it was so stressful and I was so terrified, which was weird. I felt like, ungrateful or something. I felt like I shouldn't be this stressed out. I felt like I was always gonna break out in hives.
"I managed to suppress that... But journalists would always be saying, 'Aren't you having the best time? Isn't this the best time of your life?' And logically I knew that it was, but my body was telling me that things were getting crazy and I was, like, losing my hair," she said.
Kendrick's new film "Pitch Perfect" has been released in the US and will be in UK cinemas from December 21.
