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What causes cancer?

Cancer occurs when the DNA of healthy cells in your body becomes damaged, causing the cells to multiply uncontrollably. The exact cause of this damage is unknown for many cancers. The various agents that cause damage to DNA are collectively called carcinogens. Carcinogens can be physical, such as radiation; chemical, such as cigarette smoke; or biological, such as certain viruses.

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Author: Jonathan Meddings BMedLabSc (Hons)
First answered: 18 Sep 2014
Last reviewed: 19 May 2018
Rating: 5.0 out of 5
Votes: 1504 (Click smiley face below to rate)
Category: Lung cancer


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