In recent years, the incidence of colorectal cancer in China has been on the rise, which has aroused the concern of society about this tumor. Why is the number of colorectal cancer patients increasing year by year? Who needs to be screened for colorectal cancer? Nowadays, with the advanced medical technology, colorectal cancer can be detected through screening in many cases. So, what are the screening methods of colorectal cancer? Dr. Yan Jun, deputy chief physician, told Family Doctor Online that as a popular screening, generally speaking, the simple and non-invasive screening method is the OB test of stool, also known as “occult blood test”, which looks at whether there is blood in the stool, and if there is blood, it may be colorectal cancer, and the cause should be found. If the screening OB test is positive, the doctor will need to perform further anal examinations. If suspicious symptoms are found, another colonoscopy is needed. This colonoscopy is often painless because the patient is under anesthesia for the test. This colonoscopy is often painless because the patient is under anesthesia. Colonoscopy can often accurately determine whether or not the patient has colorectal cancer. When asked by family doctors online editors which groups of people are at high risk for screening, Dr. Yan Jun, deputy chief physician, said that there are two main groups of people who need to be screened: the first group is those who have bowel cancer in their families, such as those who have polyposis in their families or those who have a history of colon cancer in one or two generations of close relatives in their families. Because bowel cancer has a genetic predisposition. The second group is people who do not have family history but have unhealthy living habits. These people often live in big cities, have westernized eating habits and diets, and are obese, or have high mental stress and regular living habits, etc. In addition, some sedentary intellectuals should also pay attention to regular medical checkups and colonoscopies for early detection and treatment.