Acute gastroenteritis vomiting blood is related to gastric perforation and pancreatic tear, part of the patients with acute gastroenteritis, there will be gastric ulcer, these people in nausea and vomiting, due to the increase in gastric pressure, the stomach wall spasm contraction, so it will cause some damage to the mucosa of the stomach wall, and even gastric perforation, in the presence of gastric perforation, not only will feel severe pain in the stomach, while part of the blood will also be accompanied by food vomiting In the event of gastric perforation, not only will the stomach feel severe pain, but also a portion of the blood will be vomited out along with the food, so blood vomiting will occur. In many patients with acute gastroenteritis, the main manifestation is violent vomiting, in which the food enters the esophagus through the cardia and is then vomited out. When vomiting is too violent, it can damage the cardia and even cause the cardia to tear, which can lead to a large amount of blood entering the stomach and the phenomenon of vomiting blood.