Pneumonia
Pneumonia
What Is Pneumonia? Pneumonia (nu-MO-ne-ah) is an infection in one or both of the lungs. Many small germs, such as bacteria, viruses, and fungi, can cause pneumonia. The infection causes your lungs’ air sacs, called alveoli (al-VEE-uhl-eye), to become inflamed. The air sacs may fill up with fluid or pus, causing symptoms such as a [...]