Upper gastrointestinal bleeding primarily refers to bleeding above the Treitz ligament. The most common causes in clinical practice are peptic ulcers, rupture of esophagogastric varices, acute erosive hemorrhagic gastritis, gastric cancer, etc. The clinical manifestations of upper gastrointestinal bleeding mainly depend on the volume and speed of the bleeding, with the main symptoms being vomiting blood and black stools. After significant blood loss, patients may experience symptoms of peripheral circulatory failure due to reduced circulating blood volume, such as dizziness, palpitations, fatigue, cold limbs, increased heart rate, and low blood pressure. If the patient enters a state of shock, it could even be life-threatening.