Black stool, in the case of uncertainty about the location of bleeding and the cause of bleeding, the physician needs to choose gastroscopy or colonoscopy according to the actual situation, such as the suspicion of upper gastrointestinal bleeding, usually do gastroscopy; such as the suspicion of lower gastrointestinal bleeding, usually do colonoscopy; if you can’t determine the situation can be gastroscopy, colonoscopy together.
Black stool in addition to exclude the impact of ingesting black food, usually caused by gastrointestinal bleeding, and gastrointestinal bleeding stool color and bleeding location, bleeding and bleeding speed.
1. Upper gastrointestinal bleeding, usually gastroscopy. Upper gastrointestinal bleeding stools are black, commonly known as tarry stools, which is because the blood loses its original red color under the action of gastric acid and the action of gastrointestinal bacteria.
However, when the amount of upper gastrointestinal bleeding is large and the bleeding rate is fast, the color of the stool can also be red. Common causes of upper gastrointestinal bleeding include peptic ulcer, gastric cancer, esophageal varices at the base of the stomach and so on.
2. Lower gastrointestinal bleeding, usually do colonoscopy. Common causes of lower gastrointestinal bleeding include intestinal tumors and vascular diseases of the intestinal wall.
It is recommended to go to the local regular hospital immediately after the appearance of black stool, do not delay, so as not to delay the condition.