The exact causes of colorectal cancer are unknown, but the disease appears to be caused by both inherited and lifestyle factors. Lifestyle factors - such as cigarette smoking, lack of physical exercise, and obesity - may increase the risk of developing the disease. Genetic factors may determine a person's susceptibility to the disease,whereas dietary and other lifestyle factors may determine which at-risk individuals actually go on to develop the disease. Most of the time no identifiable cause is found for the development of colorectal cancer in any given individual, and it is simply due to random gentic changes that have occurred in the cells lining the colon or rectum.
For more information, consult Dr. Chintamani Godbole the Best Colorectal Surgeon in Mumbai.