What is the reason for the black green stool?

There are many reasons for dark green stools, generally including food factors, drug factors, disease factors, etc. Details are as follows:

1. Food factors

If the patient recently eats too much food containing a lot of green pigment, it will stain the stool and cause the stool to turn dark green.

2. Drug factors

If the patient recently takes iron tablets such as dextran iron tablets, ferrous sulfate tablets, ferrous gluconate syrup, etc. under the guidance of a doctor, iron elements will combine with hydrogen sulfide in the intestinal tract to form iron sulfide. After being discharged together with the stool, it may cause the stool to turn dark green.

3. Disease factors

Gastric ulcers, intestinal polyps, stomach cancer and other diseases may lead to gastrointestinal bleeding. When blood and stool are mixed, the stool will turn dark green.