Health encyclopaedia - Alphabetical Topic List

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Causes of Cancer

Cancer has many causes and not all are known. There are certain general guidelines, however, which help reduce your risk from cancer.

Most cancers appear to be caused by a combination of factors including smoking, diet, sunlight, environmental factors, and inheritance.

The evidence linking cancer of the lung, for instance, to cigarette smoking is now overwhelming. But smoking can also cause cancer of the tongue and bladder and various other organs. The cancer-producing substances in cigarette smoke are absorbed into the blood and get everywhere in the body.

Similarly, excessive exposure to sunlight and regular contact with substances such as soot, tar, creosote, pitch and various mineral oils are known to cause skin cancer. See sections on specific cancers for information on their causes.