What causes sudden blackening?

Sudden black stool may be caused by dietary factors, but also may be caused by factors such as upper gastrointestinal bleeding, systemic diseases.

1, dietary factors

If a large number of animal viscera or blood products and other iron-rich food, eating easy in the intestinal bacteria under the action of trivalent iron ions reduced to divalent iron ions, and reduced to divalent iron ions are black, and then will lead to black stool color.

2, upper gastrointestinal bleeding

esophageal injury, esophageal ulcer, esophageal cardia mucosal laceration, peptic ulcer, tumor or gastric polyps and other diseases may cause upper gastrointestinal bleeding, hemoglobin in the blood, iron, in the digestive tract bacteria under the action of ferrous sulfide, easy to lead to black stool color.

3, systemic diseases

including severe heart and lung or liver disease, hemophilia, leukemia, epidemic hemorrhagic fever, sepsis, etc., can also cause gastrointestinal bleeding, and then lead to sudden black stool.