Upper gastrointestinal bleeding daily amount >5~10ml when the fecal occult blood test can be positive, daily bleeding amount >50~100ml can appear black stool.
The most common causes of upper gastrointestinal bleeding are gastroduodenal ulcer, rupture of esophagogastric fundal varices, acute erosive hemorrhagic gastritis and gastric cancer, and the rest of them are gastric torsion, esophagitis, esophageal tumors, portal hypertension, hookworm disease and mediastinal tumors.
Daily bleeding amount>5~10ml, fecal occult blood test can be positive, daily bleeding amount>50~100ml can appear black stools, for the amount of bleeding can be estimated by the blood pressure, heart rate, etc., if by lying down to sitting position blood pressure drops>15~20mmHg, heart rate than lying down>10 times/min, suggesting that the blood volume is obviously insufficient.
The above gastrointestinal bleeding should be timely to the hospital, active treatment, so as not to delay the condition.