According to World Health Organization (WHO), common risk factors for cancer include:

• Tobacco use
• Alcohol use
• Overweight and obesity
• Dietary factors, including insufficient fruit and vegetable intake
• Physical inactivity
• Chronic infections from helicobacter pylori, hepatitis B virus (HBV), hepatitis C virus (HCV) and some types of human papilloma virus (HPV)
• Environmental and occupational risks including ionizing and non-ionizing radiation