Keira Knightley caught pleurisy due to over-working

London: Actress Keira Knightley overworked herself so much that she caught lung infection pleurisy last year.

The 27-year-old had a cough and thought she had broken a rib, but in fact it was the painful lung infection, reported Mirror online. "You do period films and you get some sort of weird archaic disease. And I didn`t realise, so I went on for another month. I just stupidly never went to a doctor," she said. "I was rehearsing for this play and and then I found in rehearsals it got so bad that I couldn`t stand up any more. And they said: `Please, can you go to the doctor?`." The star went on a health kick afterwards, but with unexpected results. "My body at the end of last year was breaking and I thought, `I`ve really got to try and do something`. I`ve been trying to get myself into gear. I`ve been doing yoga, but I`ve already got injuries from yoga." PTI