Constipated stool black is what to return a responsibility

Constipation and stool blackening may be caused by dietary factors, drug factors and upper gastrointestinal bleeding. Details are as follows:

1. Dietary factors

If the patient recently eats a large amount of pig blood, duck blood, sheep blood and other iron-rich foods, it can lead to constipation and stool blackening.

2. Drug factors

If the patient recently takes ferrous sulfate, ferrous succinate, ferrous lactate and other iron agents, the drug generates black iron sulfide in the intestine, which may lead to stool blackening and constipation.

3. Upper gastrointestinal bleeding

If the patient has upper gastrointestinal bleeding, blood mixed in the stool can make the stool appear black. And due to slow intestinal motility, constipation symptoms will also occur.