Vomiting with blood in the vomit, often for the upper gastrointestinal tract symptoms, there are the following cases: 1, gastric mucosal erosion bleeding, intestinal mucosal erosion bleeding, gastric perforation, intestinal perforation, gastric ulcers and duodenal ulcers, etc., this kind of bleeding caused by the way of the blood is mostly black.2, esophageal mucosal erosion bleeding or the esophageal cardia mucosal tearing syndrome, violent vomiting will make the esophageal cardia pressure, resulting in the cardia mucosal tearing, bleeding, and then leakage of blood along with the vomit, through the mouth to form vomiting, bleeding.3, vomiting damage to the capillaries near the esophageal spout, resulting in vomiting, bleeding. Subsequently, the leaked blood will be vomited with the vomit, and then vomited out through the mouth, forming vomiting and bleeding.3. Vomiting damages the capillaries near the esophageal spout, leading to blood in the vomit.4. Biliary bleeding caused by parasites and infections.5. Oral and pharyngeal mucous membrane damage caused by repeated vomiting causes localized pressure to increase, damaging pharyngeal and oral mucous membranes, leading to localized capillary damage and rupture, and the blood leaks out along with the vomit. The blood leaks out with the vomit, and the blood is bright red due to this type of bleeding.