The digestive tract is made up of the upper and lower digestive tracts, beginning in the mouth and ending in the anal canal of the large intestine. 1. Upper gastrointestinal tract: mouth, pharynx, esophagus, stomach, duodenum. The upper gastrointestinal tract digests and absorbs food by chewing it and secreting gastric juices. 2. Lower gastrointestinal tract: the jejunum, ileum and large intestine. The large intestine includes the cecum, colon, rectum, anal canal and appendix. The lower gastrointestinal tract can fully absorb the nutrients in the food, and then the food residue will be formed into feces and excreted from the body. If the results of gastroscopy, stool routine, colonoscopy, etc. are abnormal, it is recommended to consult a doctor in time to clarify the cause of the disease and to carry out targeted treatment or therapy.