Black stools may be caused by the recent intake of blood products, the influence of drugs and gastrointestinal bleeding.
1. Influence of food: If the recent intake of blood products or animal offal is too much, it may lead to black defecation, mainly due to the fact that blood products contain hemoglobin, which is oxidized into ferrous sulfate by gastric acid during the process of digestion and absorption, and ferrous sulfate can not be absorbed by the gastrointestinal tract, so it will be retained in the stool.
2. Drugs: If you have recently taken drugs containing iron, bismuth, activated charcoal and other ingredients, this situation may also occur.
3. Gastrointestinal bleeding: after gastrointestinal bleeding, the iron in hemoglobin interacts with the bacteria in the intestines and can generate iron sulfide, which may lead to black stool color, and the amount of gastrointestinal bleeding reaches more than 50mL can be manifested as black stool.
Based on the symptom that the stool is black can not accurately determine the cause, but also need to be combined with the characteristics of the medical history, other test results to make an accurate judgment, it is recommended to clarify the cause of the disease under the guidance of a doctor.