由 消化道出血的病因 Causes and frequencies of gastrointestinal bleeding Etiology Frequency (%) Upper GIB Peptic ulcers 50 Erosions 16 Variceal hemorrhage 10 Mallory-Weiss leision Lower iB Diverticula 42 Hemorrhoids 16 Colitis 18 Post-polypectom bleeding 13 Vessel malformationCauses and frequencies of gastrointestinal bleeding Etiology Frequency(%) Upper GIB Peptic ulcers 50 Erosions 16 Variceal hemorrhage 10 Mallory-Weiss leision 5 Lower GIB Diverticula 42 Hemorrhoids 16 Colitis 18 Post-polypectom bleeding 13 Vessel malformation 3 消化道出血的病因 7