Mayo Clinic Minute: Is pneumonia bacterial or viral?
Interstitial Lung Disease at the University of Michigan
The Difference Between Bronchitis and Pneumonia
A Hidden Autoimmune Lung Disease
Pneumonia is an inflammatory condition of the lung affecting primarily the small air sacs known as alveoli. Typically symptoms include some combination of productive or dry cough, chest pain, fever, and trouble breathing. Severity is variable.