Upper gastrointestinal bleeding is relatively common in clinical practice. Its clinical manifestations mainly relate to the volume and rate of bleeding. Clinically, patients may experience vomiting blood and black stools. If a patient has a large amount of bleeding, they may develop hemorrhagic shock or hemorrhagic anemia, presenting symptoms such as dizziness, palpitations, and weakness. In such cases, patients should seek prompt treatment at a hospital, where they can receive blood transfusions, hemostasis, and volume repletion as active measures. If conditions permit, a gastroscopy can be performed to further clarify the diagnosis.