Digestive tract bleeding black stool will endanger life?

Hemoglobin in the blood after gastrointestinal bleeding will be decomposed into iron ions and sulfides in the intestinal tract. After combining with sulfides in the intestinal tract, black iron sulfide will be formed, resulting in black stool. If the bleeding volume is relatively small, the disease will be controlled after timely treatment, generally not life-threatening. However, if the bleeding volume is relatively large, it may cause hemorrhagic shock, requiring timely rescue. If it is not timely intervention, it may be life-threatening.