Family members of gastrointestinal cancer patients are often surprised, distressed and overwhelmed after learning about the disease. They all ask the same question: How can they suddenly get this disease when they were fine in last year’s physical examination? This is a very common question. As people become more and more aware of health and pay more and more attention to medical checkups, more and more people actively go for medical checkups every year, but medical checkups may miss some important diseases. Because the medical checkup package cannot cover all the body conditions, many people who have healthy medical checkup results suddenly find out cancer, and it is often in the middle and late stage, especially gastrointestinal cancer. From the mouth to the anus, there is only one long tube, which is soft and very stretchable, just like a balloon. Severe intestinal obstruction can expand the diameter of the small intestine up to 10 times. Sewers often deposit a lot of impurities, not blocked to a certain extent, water can flow down smoothly. When a blockage in the sewer is detected, a lot of impurities have already accumulated. Gastrointestinal tract blockage and sewer blockage are the same as the same reason. If something small grows in the gastrointestinal tract, there is usually no discomfort, and the water you drink and eat can pass smoothly. Even if half of it is blocked, the soft intestine can hold itself open and the food can peristaltically go down. If there is discomfort, it means that the growth has become very large, or rotten and broken, and has developed to the middle and late stage. This is very easy to understand, right? Do not think that there is no problem because there is no discomfort in the gastrointestinal tract. So it is recommended that people over 40 years of age who have not had their gastrointestinal tract checked, go for a gastroscopy to check it out.