What is double pneumonia and how does it affect the lungs?

Double pneumonia is a serious infection that affects both lungs simultaneously. The infection causes inflammation of the alveoli (air sacs in the lungs), filling them with fluid or pus. This inflammation makes breathing difficult for the patient. While the symptoms of double pneumonia are similar to those of pneumonia affecting just one lung, double pneumonia is considered more serious in nature. The condition requires greater medical attention due to its bilateral impact on lung function, as highlighted in the case of Pope Francis's recent hospitalization.