Patients with gastrointestinal problems should go to the gastroenterology department of regular hospitals and follow the doctor’s instructions for laboratory, endoscopy, breath test, imaging and other tests. 1. Laboratory tests: such as fecal routine, blood routine and other tests, which are important for checking digestive diseases. 2. Endoscopy: such as gastroscopy, colonoscopy, etc., can directly observe the patient’s gastrointestinal tract with or without lesions, but also can be suspected of lesions on the site of pathology biopsy. 3. Breath test: carbon 13 or carbon 14-urea breath test is commonly used, which is important for the diagnosis of gastrointestinal diseases, and can check whether the patient has Helicobacter pylori infection. 4. Imaging tests: such as abdominal ultrasound, CT, MRI and other tests are commonly used in gastroenterology, and are important for clarifying the disease. All of the above laboratory tests need to be conducted under the guidance of a doctor, and if there is any discomfort during the examination, notify the doctor in time to deal with it.