Gastroscopy can detect inflammation, tumors, polyps and other lesions. 1. Gastroscopy: can check out gastritis, gastric ulcer, gastric polyp, gastric tumor and other lesions. 2. Enteroscopy: It mainly observes all colorectal lesions from the anus to the ileocecal valve, and can detect rectal tumors, colon tumors, proctitis, colitis, appendiceal polyps, appendiceal tumors, as well as intestinal obstruction, ulcerative colitis, Crohn’s disease and other different lesions. Gastroenteroscopy also has a role in treatment, for example, early cancers and polyps can be removed endoscopically, foreign bodies in the stomach and intestines can be removed through microscopy, and hemorrhagic lesions can be treated endoscopically with hemostasis. Gastroenteroscopy should be operated by specialized doctors.