Gastrointestinal diseases are examined by gastrointestinal endoscopy, such as electronic gastroscopy, electronic colonoscopy, small intestine microscopy and capsule endoscopy, etc. The above endoscopy is the most reliable method for diagnosing gastrointestinal diseases. In clinical practice, electronic gastroscopy and electronic colonoscopy are more commonly performed, while small bowel microscopy is more complicated, so most hospitals do not perform it. In addition, the cost of capsule endoscopy is relatively high and unacceptable to most people. The presence of stomach discomfort requires prompt gastroscopy to help clarify the presence of upper gastrointestinal disorders. If there are changes in the stool, it is also recommended to cooperate with the doctor to improve the e-colonoscopy as appropriate to help clarify whether there are intestinal lesions.