In the acute phase of upper gastrointestinal bleeding, it is recommended that the patient does not consume food and the bleeding situation is observed. Once the condition stabilizes, a liquid diet can be initiated, which may include water, soups, and porridge. Common causes of upper gastrointestinal bleeding include gastric ulcers, duodenal ulcers, vascular malformations, inflammation, and more. Treatment varies depending on the cause; for gastric and duodenal ulcers, medication is generally an option. If the bleeding is due to vascular malformations or tumors, endoscopic treatment or surgical intervention may be necessary. Upper gastrointestinal bleeding is relatively common clinically, typically presenting with symptoms of vomiting blood and bloody stools. Significant bleeding can also lead to symptoms such as dizziness, weakness, and chest tightness due to low blood volume. Diagnostic procedures mainly include complete blood count, stool tests, electrocardiograms, and crucially, gastroscopy, which is essential for identifying the specific cause of the bleeding.