There are various causes of hematochezia, among which diverticulum hemorrhage is a pathological condition that is often encountered in the clinic and often occurs repeatedly. Therefore, if a patient who has a history of diverticulum hemorrhage presents with hematochezia, conservative treatment is usually administered based on the assumption that the patient has diverticulum hemorrhage and in many cases endoscopy is not performed. We experienced an 85-year-old patient who developed melena three times and whose cause of melena the first time was diverticulum hemorrhage but whose causes of melena the second and third times were different. Just because it is the same symptom in the same person, the cause is not necessarily the same. It is thought that performing endoscopy immediately after melena, taking into consideration various possibilities, is always useful for finding the cause of hematochezia and hemostasis.
