1. Some digestive tract diseases can cause melena, including liver cirrhosis complicated with esophageal or gastric varices rupture, esophageal foreign bodies, ulcers, acute gastritis, gastric mucosal prolapse, intussusception, hemorrhagic necrotizing enteritis, strangulated intestinal obstruction, Meckel's diverticulum, intestinal polyps, anal fissure, gastric cancer, etc. , can cause black stool and tar color.
2. Some foods can cause black stool: Eating some foods can cause changes in stool color, which is sometimes easily confused with blood in the stool. For example, after eating pig's blood, sheep's blood or chicken's, goose's, duck's blood, or a large amount of beef and pig's liver, the iron in animal's blood can form black iron sulfide in human intestine, making the stool black; Others, such as eating a lot of bayberry jam and mulberry jam, may make the stool black.
3. Some drugs can cause black stool: oral active carbon powder, blood-enriching iron agent, bismuth agent for treating stomach diseases and some Chinese medicines can also cause black stool.
4. Some blood diseases can also cause melena: neonatal hemorrhage, hemophilia, leukemia, aplastic anemia, thrombocytopenia, allergic purpura, etc. can all cause melena.
5. It can also cause some systemic infectious diseases, such as septicemia and typhoid fever. Newborns can swallow blood from the mother's birth canal or ruptured nipples, and swallowing bleeding from the nose, pharynx and gums can make the stool black. I hope to go to the hospital for examination and symptomatic treatment.