Pneumonia—Adult

(Community-Acquired Pneumonia; CAP; Bronchopneumonia)

Definition

Pneumonia is an infection that affects the small airways and air sacs in the lungs.
Development of Pneumonia in the Air Sacs of the Lungs
pneumonia lung fluid
Normal gas exchange is interrupted by fluid build-up.
Copyright © Nucleus Medical Media, Inc.
Pneumonia is sometimes described by where and how you were infected. Types of pneumonia include:
  • Community-acquired—from the community, such as a school, gym, or at work
  • Nosocomial—in a hospital or healthcare setting
  • Aspiration—happens when foreign matter is inhaled into the lungs, such as food, liquid, saliva, or vomit

Causes

Pneumonia may be caused by:
  • Infection from specific types of:
    • Bacteria
    • Viruses
    • Fungi
  • Aspiration
  • Other specific germs
  • Chemical exposure and irritation
Aspiration
lung aspiration food
Copyright © Nucleus Medical Media, Inc.

Risk Factors

Pneumonia is more common in older adults. Other factors that may increase your chance of pneumonia include:

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