Can chronic constipation cause colon cancer?

DIET NOT constipated. Not constipation per se , but diet may a factor: diets high in whole grain, fruits, and veggies have been linked with a lower risk of colorectal cancer, but fiber supplements have not been shown to prevent colo-rectal cancer. Excess red meats and processed meats can increase your colorectal cancer risk and cooking meats at very high heat may create chemicals that might increase cancer risk.
Indirectly. Constipation is typically caused by a diet low in fiber. Eating whole grains, fruits and vegetables regularly (fiber sources) can lower your chances of developing colon cancer.