What is the reason why stool is black recently

Recently, stool is black, considering dietary factors, drug factors, gastrointestinal bleeding, etc.

1, dietary factors

recently eating a large number of animal liver, animal blood products and other foods, can cause stool black, belongs to normal physiological phenomenon, generally without special

treatment.2, drug factors

recently under the guidance of a doctor to take iron, bismuth and other drugs, can cause black stool, generally after stopping symptoms can be relieved

by themselves.3, gastrointestinal bleeding

recent stool black is also considered esophagitis, esophageal ulcer, cirrhosis esophageal varices bleeding, acute erosive hemorrhagic gastritis and other diseases caused.