Black means lower gastrointestinal bleeding?

Black stool is

not accompanied by other discomfort symptoms, is being examined with the help of a doctor, the lower digestive tract tissue function is normal, may be caused by eating a large number of foods containing melanin. If there is black stool symptoms, accompanied by abdominal pain symptoms, after examination of colon, rectum or anus and other parts of the injury and bleeding, blood will be decomposed in the intestine, hemoglobin after chemical reaction to produce black substances, resulting in black stool.

It is recommended that patients with frequent black stool and other discomfort, need to go to the hospital for regular examination and treatment.