Gastrointestinal bleeding symptoms depend on the amount of digestive bleeding, the speed of bleeding, the site of bleeding, and age and circulatory compensatory capacity, as follows: 1, vomiting blood and black stool: upper gastrointestinal bleeding are black stool, bleeding site above the pylorus, often accompanied by vomiting blood; less bleeding, slow speed, there can be no vomiting blood, only black stool; vomiting blood is coffee-colored or brown, such as a large amount of bleeding, fully mixed with gastric juice, for bright red; black stool is tar-like, sticky and shiny; 2, bloody stool or dark red stool: mostly caused by middle and lower gastrointestinal bleeding, usually without vomiting blood; 3, hemorrhagic peripheral circulation failure: acute massive bleeding patients can appear dizziness, panic, weakness, sudden rise will appear syncope, cold limbs, increased heart rate, low blood pressure, etc., serious shock state; 4, anemia and blood picture changes: acute massive bleeding will Hemorrhagic anemia, mild anemia or no anemia is common in clinical practice; 5, fever: some patients may have hypothermia within 24h, which may be related to peripheral circulatory failure leading to central thermoregulatory dysfunction; 6, azotemia: renal function check shows elevated urea nitrogen.