Hammar, Samuel P. Diagnostic Specialties Laboratory, Bremerton, Washington.
Last reviewed:June 2018
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- Infectious pneumonia
- Hypersensitivity pneumonitis
- Drug-induced pneumonitis
- Other types of pneumonitis and agents
- Signs, symptoms, and diagnosis
- Links to Primary Literature
- Additional Readings
An acute or chronic inflammatory disease of the lungs. Pneumonia (Fig. 1) is a serious inflammatory lung disorder that can affect one or both of the lungs. It is caused by numerous microbial, immunological, physical, or chemical agents, and it is associated with exudate in the lumens (inner spaces) of the lung's alveoli (tiny air sacs). More specifically, when the lung inflammation is caused by an infectious agent, the condition is called pneumonia; in contrast, when the inflammatory process in the lung is not related to an infectious organism, it is usually called pneumonitis. See also: Inflammation; Lung; Respiratory system disorders
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