Gastrointestinal body scanning tests are performed using ultrasound and abdominal CT and are not very reliable. Gastrointestinal body scanning examination can only do some simple and basic gastrointestinal examination. Gastrointestinal body scanning does not clearly see the details of the mucosa of the gastrointestinal tract, such as inflammation, erosion, ulcers, small polyps, etc., and the accuracy of the examination is not high, so the gastrointestinal body scanning is generally not used to do a more detailed examination of gastrointestinal diseases. The diagnosis of esophageal, gastric and intestinal diseases, such as reflux esophagitis, esophageal cancer, gastritis, peptic ulcer, intestinal tuberculosis, gastric cancer, colorectal cancer, etc., need to rely on gastrointestinal microscopy, which can visualize the detailed condition of the gastrointestinal tract mucosa and can be taken for pathology. Specific tests should be conducted under the guidance of a doctor.