The main items to be checked in the gastrointestinal examination are: urea breath test, routine stool, tumor markers, as well as gastroenteroscopy and blood tests. 1. Urea breath test: It is used to screen the stomach for Helicobacter pylori infection, and is widely used in the clinic because it is non-invasive and painless, and there is no risk of cross-infection. 2. Stool routine: Used to check the shape, color, and odor of the stool, and also to check for abnormal bacteria and cells. By checking whether there are blood cells, it can help to diagnose gastrointestinal bleeding and hemorrhoids and other diseases. 3. Tumor markers: mainly used for colorectal cancer and gastric cancer screening. 4. Gastroenteroscopy: for digestive bleeding, gastrointestinal polyps, ulcers, tumors and other diseases can be more clearly diagnosed, while gastroenteroscopy can also be minimally invasive treatment, for some of the more subtle lesions, gastroenteroscopy has a better diagnostic effect. 5. Blood test: such as blood routine, liver function, etc., can be used for general screening.