Estimation of bleeding volume in upper gastrointestinal bleeding generally needs to be analyzed according to the patient’s clinical symptoms. 1. Occult blood: If the stool test is positive for occult blood, the amount of bleeding is usually relatively small, and the amount of bleeding is probably more than 5 milliliters. 2. Black stool: If there is black stool, that is, the color of stool changes, the bleeding volume is usually more than 50 ml. 3. Vomiting blood: there may be bright red or coffee-colored blood bleeding is usually more than 250 ml. 4. Dizziness, palpitations, weakness: the bleeding volume is more than 400 milliliters. 5. Shock: accompanied by symptoms such as pallor, cold and clammy limbs, irritability or confusion, and the bleeding volume is greater than 1,000 milliliters. In addition, symptoms of upper gastrointestinal bleeding may cause serious health damage, and patients are advised to actively go to the hospital for treatment.