Upper gastrointestinal bleeding does not necessarily result in black stools or vomiting of blood. If the bleeding is very minor, such as less than 5ml, there will be no black stools or vomiting blood, and the bleeding can only be detected through a fecal occult blood test which shows a positive result. If the bleeding amounts to about 50ml, vomiting blood may not occur, but black stools can be present. If the bleeding reaches about 200ml and occurs rapidly, both vomiting of blood and black stools may occur simultaneously. Upper gastrointestinal bleeding is a common and critical condition in gastroenterology that requires standardized treatment measures. The first step is to conduct a thorough gastroscopic examination, followed by measures to suppress gastric acid production and protect the gastric mucosa.