The feces are black. What happened?

Feces are black, usually caused by excessive iron intake, gastric ulcer, intestinal bleeding and other reasons, details are as follows:

1, excessive iron intake

If the patient recently eats too much iron-rich foods, such as pig liver, duck blood, black fungus, etc., iron is not completely absorbed by the body, it will combine with sulfide in the intestinal tract, resulting in black feces.

2, gastric ulcer

If the patient has gastric ulcer, the gastric mucosa will be damaged and bleeding will occur. After the blood enters the digestive tract, an oxidation reaction will occur, forming ferrous, and with the excretion of feces, it will appear as black feces.

3, intestinal bleeding

When intestinal bleeding occurs, the blood will contact with intestinal fluid during the process of passing through the digestive tract, and part of hemoglobin will be decomposed into hemoglobin derivatives, in which the blood iron will be oxidized to form black feces.