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What causes pneumonia?

Pneumonia is usually caused by an infection with bacteria or viruses that have been inhaled into the lungs. Your body's immune system then sends white blood cells to attack the germs that are causing the infection. This causes the air sacs in the lung to become filled with fluid and mucus, which can cause difficulty breathing.

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About this article

Author: Dr Joanne Van der Velden PhD, BSc (Hons)
First answered: 18 Sep 2014
Last reviewed: 19 May 2018
Rating: 4.8 out of 5
Votes: 839 (Click smiley face below to rate)
Category: Bronchitis


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