Black and yellow stool, the surface is a little black, what is going on

Black and yellow stool, the surface is a little black, may be diet, drugs, digestive tract diseases and other factors caused by, correlation analysis is as follows:

1. Diet

if eating pig blood, duck blood, chicken blood and other foods containing iron, after digestion through the digestive tract, will form black substances, resulting in black stool color.

2. Take drugs

If a large number of ferrous sulfate tablets, dextran iron tablets, ferrous gluconate syrup and other drugs, which iron after gastrointestinal digestion, will produce black precipitate, resulting in stool color blackening.

3. Digestive tract diseases

If there is stomach bleeding, intestinal bleeding, intestinal polyps and other diseases, blood into the digestive system, will be absorbed and digested, and the air in the intestinal tract oxidation, resulting in stool surface blackening.