Ultrasound generally cannot detect intestinal problems. Ultrasound has good recognition of lesions in parenchymal organs, such as the thyroid, liver, heart, spleen, and kidneys, but is susceptible to gas interference. The recognition of organs with more gas interference, such as the lungs or cavity organs, is lower. Ultrasound can look at the stomach and duodenum, but only after oral administration of a large amount of special contrast fluid to get a general look at the morphology of the duodenal mucosa and the presence or absence of occupying lesions. However, its diagnosis of local inflammation is poor, and there is more intestinal gas, also accompanied by a large amount of intestinal contents, so ultrasound generally does not look at the intestinal tract. Gastrointestinal tract examination is preferred to gastroscopy. For special areas or where endoscopy is contraindicated, capsule gastroscopy, full gastrointestinal barium meal fluoroscopy, and CT scan of the abdomen can be used.