The following are known as causes of colon cancer:
1. Age, people above 50 develop more polyps. Virtually all colon cancer develops from adenomatous polyps in the colon, generally referred to simply as colon polyps.
2. Research shows alcohol increases risk of colon cancer. Moderation is the key.
3. Diabetes. Having this disease not only makes your body difficult to heal wounds and affect your eyesight but it also increase your risk of colon cancer. In general, diabetics are up to 40% more likely to develop colon cancer than people who don't have diabetes.
4. Diet. Diet rich in fat and cholesterol not only increases risk of having colon cancer but heart disease as well. Eat more food rich in fiber such as fresh fruits and leafy vegetables.
5. Environment. The more stressful and polluted your environment adds getting free radicals on your body. This helps in developing cancer cells.
6. Inflammatory Bowel Disease. Inflammatory bowel disease, often characterized by conditions such as ulcerative colitis and Chron's disease, increases the risk of developing colorectal cancer. In general, the longer a person has had inflammatory bowel disease, the greater his or her chance of developing colorectal cancer.
7. Lack of exercise. Being lazy to exercise or just walk around does not help burn calories and fats on your body. No sweat retains more salt on your body. The effect, increase chances of developing colon cancer and heart disease.
8. Obesity. Lack of exercise and poor diet leads you to obesity. Once you are obese, it gets harder to get back on shape and gets easier to add more weight. More fats on your body prevents good blood circulation. An increase chance or diabetes is also common to obese people.
9. Smoking. Long-term cigarette smoking causes colon cancer for two main reasons. First, inhaled or swallowed tobacco smoke transports carcinogens to the colon. Second, tobacco use appears to increase polyp size.

Processed food, not enough fiber in the diet, food with too many preservatives, too much alcohol, too much smoking, too much exposure to carcinogens at the job and at work (radiation), not enough fresh fruit and vegetables in the diet (anti oxidants), stress, not getting the proper check ups with medical doctor to detect a problem before the problem becomes severe.

The causes for colon cancer are:
Age
Alcohol
Diabetes
Diet
Environment
Race
Family Medical history
Gender
Genetics
Inflammatory Bowel disease
Lack of fitness
Obesity
Personal Medical history
Polyps
Smoking