Patients with upper gastrointestinal bleeding typically present with vomiting blood or bleeding from the stool. Of course, if the bleeding amount is small, there may be no other discomfort. However, if the bleeding is significant, symptoms may include dizziness, fatigue, chest tightness, and palpitations related to low blood volume. Some patients might also experience abdominal discomfort, such as abdominal pain, bloating, or even indigestion. For those suspected of upper gastrointestinal bleeding, it is advisable to further complete blood tests, stool analysis, and electrocardiograms. It is necessary to promptly carry out a gastroscopy when needed to clarify the cause of the bleeding, and consider if it is due to ulcers or vascular malformations. In the early stages of treatment, symptomatic management should be prioritized, and patients are advised to actively rehydrate to improve symptoms of low blood volume and to transfuse red blood cells if necessary to correct anemia. Once the cause is identified, causative treatment should be added, such as the use of acid-suppressing and gastric-protecting drugs for bleeding associated with peptic ulcers. (The use of medications should be under the guidance of a doctor.)