Colon cancer (colorectal carcinoma) is a malignant tumor in the area of the colon or rectum. It often develops from benign colon polyps. Colorectal cancer is one of the most common types of cancer in both men and women. If colorectal cancer is detected in time, a cure can be achieved with the help of an operation and other therapy methods. In this picture gallery you can see which symptoms and signs indicate colon cancer and when you should see a doctor.