Pneumonia causes more than a million hospitalizations and 50,000 deaths per year in the U.S., according to the American Lung Association.
Pneumonia is an infection that inflames the air sacs in one or both lungs. The air sacs may fill with fluid or pus, causing cough with phlegm or pus, fever, chills, and difficulty breathing.
Pneumonia can range in seriousness from mild to life-threatening. It is most serious for infants and young children, people over 65, and people with health problems or weakened immune systems.
