Stevie Nicks Flu Forces Fleetwood Mac Tour Postponement

“While she is feeling better already, management has consulted with her doctors and have decided to reschedule the remaining four shows of their North American tour to allow for her full recovery,” the band said in a statement.

“We are having more fun than ever on this current tour, but as we all know, touring life comes with its challenges, "Mick Fleetwood added. "The flu has sidelined Stevie for a couple of weeks, but she is on the mend and we look forward to getting back out on the road. We so apologize to the fans, but we are working on rescheduling.” FULL STORY

Some speculate she has more than the flu (possibly Pneumonia) - but no official news had been heard as of yet.