What causes black feces?

Black stool may be related to unreasonable diet, taking drugs, gastrointestinal bleeding and other reasons.

1. Unreasonable diet

If excessive intake of black food such as dark chocolate, black sesame, black beans, etc., may lead to black food residues, and then lead to black stool.

2. Taking drugs

If iron is taken for a long time, such as ferrous sulfate tablets, ferrous gluconate syrup, dextran iron tablets and other drugs, which are rich in iron, may react with sulfide in the intestinal tract to form iron sulfide, mixed with feces, will make feces appear black.

3. Gastrointestinal bleeding

Gastric ulcers, intestinal polyps, gastric cancer and other digestive tract diseases may lead to gastrointestinal bleeding. When blood and feces mix, oxidation occurs in the intestinal tract, it will lead to black stool.