When the amount of bleeding is more than 500ml, it is gastrointestinal hemorrhage. Gastrointestinal hemorrhage is commonly seen in the following diseases: 1, gastric ulcer bleeding, these patients usually have a history of gastric ulcer, and have a large amount of alcohol consumption before the onset of the disease, which leads to rupture of the ulcer, acute perforation will lead to gastric hemorrhage, and the amount of bleeding is often more than 100 ml. 2, acute abdominal trauma, this kind of patients often have a history of trauma before the onset of the disease, such as collision, fighting, etc., which leads to acute rupture of viscera such as rupture of the spleen, rupture of the liver, etc., resulting in abdominal hemorrhage, and if not rescued in time, it is easy to lead to acute hemorrhage. This will lead to abdominal hemorrhage, which will easily lead to acute hemorrhagic shock if not rescued in time.3. Rectal cancer, long-term rectal cancer will invade the mucous membrane of gastrointestinal tract, which is easy to break and bleed. All the above situations must be treated in time to avoid life-threatening.