Last time I was in the hospital, there was a patient who was definitely faking her symptoms. She would fake passing out a couple times a day, sometimes complete with fake seizures. It was obvious she was faking because she would be sure to always do it right in front of the nurses station; you could see her looking around just before hand to time it just so for the greatest effect. It was annoying as heck. Clearly she had psychological issues, but the passing out was not a real medical issue.
It was a fairly common occurrence in the hospital to see faked symptoms used to get attention or for drug seeking.