Pope France, who has been in the hospital since February 14, experienced two episodes of acute respiratory insufficiency, caused by a significant accumulation of endobronchial mucus and consequent bronchospasm.

Pope Francis on Monday suffered two attacks of "acute respiratory insufficiency," the Vatican said, as the 88-year-old continues his health fight.

The Vatican said Friday that Pope Francis is on a breathing machine after suffering a sudden respiratory episode during his hospitalization.

The Vatican said the pope responded well to the treatment, with a good level of gas exchange, and remained conscious and alert at all times.

Francis, who has been in Rome's Gemelli Hospital since February 14, is again receiving "non-invasive, mechanical ventilation" to help with his breathing.

ROME and LONDON -- Pope Francis' condition remained stable on Tuesday, and his prognosis remains reserved, according to the Vatican. The pope had needed medical intervention amid two episodes of "acute respiratory failure" on Monday, Vatican sources told ABC News.

Pope Francis, hospitalized for more than two weeks with pneumonia in both lungs, suffered two acute respiratory failures, requiring intervention, the Vatican says.

ROME and LONDON -- Pope Francis suffered two episodes of "acute respiratory failure" on Monday, the Vatican said. The episodes were caused by a "significant accumulation of endobronchial mucus and consequent bronchospasm," the Vatican's press office said in a brief statement.

Pope Francis, 88, was placed on a non-invasive mechanical ventilator after a bronchospasm caused him to inhale vomit. His condition is “guarded.”

Pope Francis suffered two episodes of "acute respiratory insufficiency" on Monday, the Vatican said, a setback for the 88-year-old pontiff as he battles double pneumonia. Francis, who has been in Rome's Gemelli Hospital since February 14, is again receiving "non-invasive, mechanical ventilation" to help with his breathing.

The pope "rested well during the night" and woke shortly after 8 a.m. this morning, his 20th day in hospital, as his condition remains stable and his prognosis remains reserved, according to the Vatican.

Pope Francis "slept all night" following Monday's medical intervention amid two episodes of "acute respiratory failure," the Vatican said Tuesday. "The pope slept all night, now he continues his rest,