What is black green shit?

It may be caused by bleeding in the digestive tract, or by drugs that may cause black-green stools. Of course, it may also be caused by iron-containing foods eaten by the patient in the diet, such as bismuth potassium citrate or bismuth pectin, pig blood, chicken blood, etc., which may also cause black-green stools. If the stool is black and green, it is necessary to ask the patient's diet and medication in detail, conduct a detailed physical examination, improve the occult blood test of the stool. If necessary, it is also necessary to conduct an electronic gastroscopy and detection of Helicobacter pylori to confirm the diagnosis of the disease.