Upper gastrointestinal bleeding is relatively common in clinical practice, generally manifesting as vomiting blood or defecating blood; typically, the amount of blood vomited is larger while the quantity of blood in stool is less. It can generally be assessed by the following indicators: First, the situation of vomiting blood and blood in stool; second, the change in hemoglobin; third, the change in blood pressure. It is generally believed that if there is a problem with blood pressure, such as low blood pressure, the bleeding is usually significant. Second, by measuring the change in hemoglobin, it is generally considered that a decrease of 10g/L in hemoglobin corresponds to an estimated blood loss of around 400ml; of course, clinically, mild to moderate anemia is especially common. The appearance of vomited blood, generally considered to be more than 250ml, can be accompanied by vomiting and melena, which are commonly seen clinically, whether the bleeding is from the upper or lower gastrointestinal tract.