Pope Francis remains in a critical but stable condition and was resting Wednesday in the hospital as Catholics gather in Rome to pray for him. "The pope spent a quiet night and is resting," said the typically brief early morning statement from the Vatican.

The pope spent another 'quiet night' in Rome's Gemelli Hospital, where he has been recovering from a bout with bronchitis since Feb. 14, the Vatican said Wednesday.

Concerns over Pope Francis' health have mounted in recent years as have questions about his succession. Here's what we know.

Pope Francis, battling double pneumonia, had a quiet night in hospital and is resting, the Vatican said on Wednesday.

Pope Francis remains in critical condition but is stable and returned to work Tuesday evening, the Vatican announced.

Is Pope Francis going to live? Is he going to die? Will he remain as pope? Dr. Marc Siegel, Fox News senior medical analyst, shares his expert insights on the pope's condition and prognosis.

The pontiff's condition is touch-and-go, given his age, fragility and pre-existing lung disease, according to doctors.

The chaplain of the Agostino Gemelli Hospital, where Pope Francis remains hospitalized, has called for faith and prayer, urging Catholics to embrace "hope against all hope" as concerns over the pontiff's health persist.