Constipation and black stools are mostly related to diet, drugs and diseases that cause gastrointestinal bleeding, such as spinach, dragon fruit, iron, bismuth, gastroduodenal ulcer.
Constipation is due to slow gastrointestinal peristalsis, manifested by dry stools and difficult defecation. The cause of black stool is eating certain vegetables and fruits, drugs, diseases causing gastrointestinal bleeding.
1. Diet: such as taking dark-colored food, animal blood containing iron. Excessive consumption of dark-colored food will be mixed in the feces without digestion and absorption to form black stools. The iron in animal blood can form black iron sulfide in the intestines, producing black stools.
2. Drugs: such as oral activated charcoal, iron, bismuth, because the dark color and iron sulfide can cause black stool.
3. Diseases: for example, gastroduodenal ulcer causes gastrointestinal bleeding, hemophilia, leukemia and other blood diseases can also lead to the production of black stools, because the iron in the blood in the intestinal tract to form iron sulfide, resulting in black stools.
It can be seen that the black stool produced by constipation will disappear after diet and medication are stopped. Repeated black stools should be alerted and related to digestive tract and blood system diseases, and should be diagnosed in time and treated according to the doctor’s instructions.