About more than 70% of colorectal cancer (colorectal cancer) is already a middle to late stage tumor when it is found again, which is very difficult to treat and has a low survival rate. Finding early colorectal cancer is the most important way to improve the treatment effect. In fact, it is very simple to prevent colorectal cancer. You only need to do: 1. fecal occult blood test once a year; 2. colonoscopy for those with positive fecal occult blood test.