What are the main causes of black stool?

Stool blackening may be a normal physiological phenomenon, may also be related to gastric ulcer, ulcerative colitis and other pathological factors.

1, physiological phenomenon

If the body in a short period of time to eat a large number of animal organs, such as pig liver, duck liver, etc., may lead to excessive iron intake, resulting in stool blackening phenomenon.

2, gastric ulcer

and Helicobacter pylori infection, taking non-steroidal anti-inflammatory drugs and other factors. Some patients may appear gastric bleeding phenomenon, manifested as dark red stool or tarry black stool.

3, ulcerative colitis

The cause is not clear, generally and immune dysfunction, intestinal flora imbalance and other factors. Patients with small intestinal bleeding did not timely excretion, after oxidation, may appear stool blackening.