The main causes of oral cancer include:
- Tobacco use (90 percent of people with oral cancers use tobacco by smoking cigarettes, cigars, pipes, chewing tobacco and dipping snuff).
- Alcohol use.
Other causes of oral cancer may include:
- Leukoplakia – a condition characterized by a whitish patch that develops inside the mouth or throat.
- Erythroplakia – a condition characterized by a red, raised patch that develops inside the mouth.
- Excessive sun exposure, which, like elsewhere on the body, can cause cancer on the lip.
The link below also provides information about risk factors and ways of reducing them.

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