What is the cause of black stool color?

Stool color blackening may be caused by drug factors, peptic ulcer, systemic diseases, etc.

1. Drug factors

If patients take bismuth, iron, antiplatelet and anticoagulant drugs for a long time, some drug components will react chemically in the digestive tract, resulting in stool color blackening.

2. Peptic ulcer

When suffering from peptic ulcer, it will lead to abnormal gastrointestinal motility, increased gastric acid secretion, resulting in ulcer surface rupture, causing gastrointestinal bleeding, and stool color blackening.

3. Systemic diseases

If they suffer from leukemia, hemophilia, sepsis and other systemic diseases, they may also cause gastrointestinal bleeding, resulting in stool color blackening.