Gastrointestinal bleeding requires prompt treatment whether it is upper, middle, or lower gastrointestinal bleeding. Untreated GI bleeding has both acute and chronic consequences. A small amount of GI bleeding can cause chronic consequences, as the bleeding etiology persists and repeated bleeding can lead to chronic anemia. In young patients, growth and development can be affected by reduced nutritional intake, and in elderly patients with cardiopulmonary disease, symptoms can be aggravated and, in severe cases, life-threatening. A large amount of bleeding may cause acute consequences, and patients may experience syncope, chest tightness, profuse sweating, shortness of breath and other shock manifestations, which may be life-threatening in severe cases.