Signs and symptoms of GI bleeding can be either obvious (overt) or hidden (occult). Signs and symptoms depend on the location of the bleed, which can be anywhere on the GI tract, from where it starts — the mouth — to where it ends — the anus — and the rate of bleeding. GI GI Overt bleeding might show up as: 
Vomiting blood, which might be red or might be dark brown and resemble coffee grounds in texture
Black, tarry stool
Rectal bleeding, usually in or with stool
 With occult bleeding, you might have: 
Lightheadedness
Difficulty breathing
Fainting
Chest pain
Abdominal pain
 Symptoms of shock If your bleeding starts abruptly and progresses rapidly, you could go into shock. Signs and symptoms of shock include: 
Drop in blood pressure
Not urinating or urinating infrequently, in small amounts
Rapid pulse
Unconsciousness
