
1. Family history of cancers
2. Overexposure to the sun
3. Tobacco and passive smoke
4. A diet low in fiber
5. Poor diet, lack of physical activity or overweight
6. Abuse of alcohol
7. Too much radiation from various sources
8. Growing age
9. Inadequate amounts of certain vitamins and minerals
10. Certain chemicals and other substances (e.g. Asbestos, benzene, benzidine, cadmium, vinyl chloride and nickel)
11. A prolonged stressful life
12. Certain viruses and bacteria (such as Hepatitis B, Hepatitis C and HIV).


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