The Artist: Lady Gaga
The Exhaustion: Just moments before she was scheduled to take the stage at a show in Indiana in January, Gaga started suffering breathing problems. Doctors later told her that exhaustion and dehydration were the causes of the problems.
The Result: Gaga cancelled a handful of shows in January. However, we're afraid she didn't take enough time off because she also nearly collapsed at a show in New Zealand in March. She cited jet lag, but she also admitted that she continues to struggle with exhaustion because of all the traveling that she does.