Factors which increase the risk of having cancer are:
1. Age: although cancer can occur at any age, it is more likely to happen in adult ages, in age 60 years old and above.
2. Lifestyle: certain habits can play an important role in developing cancer or preventing it. For example, alcohol consumption of more than 1 drink a day for men above 65 years old and women at any age, can increase the chances of having cancer.
3. Environment: the environment around us can be harmful even if we have a good lifestyle. For example, being a secondhand smoker (sitting beside someone who smokes).
4. Health condition: if you are suffering from chronic diseases as colon inflammation, or have a viral infection as HPV (Human Papilloma Virus).