True black stools are black or brownish-black in color, not the normal yellow. The main causes of black stools are gastrointestinal bleeding, diet, medications, etc.
1. Gastrointestinal bleeding: A history of gastrointestinal diseases, such as gastric ulcer, gastrointestinal tumors and other causes of gastrointestinal bleeding, if the gastrointestinal bleeding is less and slower, the blood stays in the gastrointestinal tract for a longer period of time, then black stools may be discharged. Black stools caused by gastrointestinal bleeding are usually black and shiny, like tar, and can have a special odor of sulfide.
2. Diet: As a result of eating animal blood products, such as pig’s blood, duck’s blood, chicken’s blood, etc., the stools contain too much iron, and black stools appear after oxidation.
3. Drugs: black stools may appear after anemic patients take drugs containing iron.
Excluding physiological factors, patients with black stools, it is recommended to consult a doctor in a timely manner, under the guidance of the doctor for targeted treatment.