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.
According to doctors, acute respiratory failure indicates the pope was not responding to oxygen therapy. Endobronchial mucus means there is mucus and fluid in the deep parts of the lung or lungs, causing a bronchospasm, also known as a coughing attack, doctors said.
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