The failure of gastroscopy to detect a bleeding spot is considered to be related to the site of bleeding having recovered, missed examination, bleeding from other sites, and the use of certain medications. 1. Recovered bleeding site: Smaller bleeding sites may have healed by the time of examination, especially in patients who have not been seen in time. 2. Missed examination: Food residue may cover up small bleeding sites and cause missed diagnosis, especially when eating coarse fiber and greasy food. 3. Bleeding from other parts: the bleeding site is not in the esophagus, stomach and duodenum, gastroscopy naturally cannot find the bleeding site. Such as oral mucosa, colon and other parts of the bleeding. 4. Drug reasons: such as taking acid-suppressing drugs, mucosal protective agents and other drugs, which can promote the recovery of the bleeding mucosa, may also appear in the above situation. For the gastroscopy can not find bleeding points of the case, it is recommended by the doctor combined with the history, symptoms and other tests to comprehensively analyze the causes.