what causes a patient to have black emesis
Vomiting blood is a common symptom that may indicate bleeding in the upper GI tract (UGIB). Vomit that resembles coffee grounds usually means that blood has been oxidized by acid in the stomach so that the iron in the blood turns black, and is a sign that bleeding is either in a small quantity or has stopped. Vomiting red blood usually means the bleeding is recent or more severe.