The press office for the Vatican said Sunday that Pope Francis was able to rest overnight as he slowly recovers from double pneumonia after initially being hospitalized for bronchitis.

What does Pope Francis having "double pneumonia" mean? What should you look for in the elderly? How can you avoid getting pneumonia?

With Pope Francis in critical condition following a respiratory crisis and complicated lung infection in recent days, one Canadian doctor says that dealing with the complications could be “unpredictable.