Gastric ulcer and bleeding may cause fainting when the amount of bleeding is large, but in most cases fainting does not occur. When bleeding from gastric ulcer occurs, the first clinical symptom is black stool, and the patient will also have abdominal discomfort, such as epigastric pain with nausea, regurgitation, poor appetite and loss of appetite. If the patient has a high suspicion of gastric bleeding, it is recommended to go to the hospital promptly. Because a small number of gastric ulcers and bleeding may occur with hemorrhage, it will cause a decrease in the blood volume of the whole body, which will lead to ischemia and hypoxia of the brain, so fainting and fainting will occur, which is a manifestation of shock. In conclusion, patients with gastric bleeding, whether it is caused by gastric ulcer or other causes, patients need to pay attention to it and go to the hospital in time.