Marion Cotillard had panic attacks on 'Macbeth' set

The role of Lady Macbeth in "Macbeth" pushed Marion Cotillard so physically and psychologically that the actress suffered from panic attacks on the film's set.

The 39-year-old plays Lady Macbeth opposite actor Michael Fassbender in the titular role in the big screen adaptation of the Shakespeare play.

Although she has been making movies for the past three decades, Cotillard started suffering from bouts of fear.

"When I start a movie I usually freak out...This time it was pretty physical and intense. Panic attacks...I never had panic attacks before. What was funny is I didn't know what a panic attack was, but I had studied it for the role I did before (in 'Two Days, One Night')," Cotillard told Porter magazine.

Although Cotillard had never had panic attacks before her research for "Two Days, One Night" helped her cope with them.