What disease is common in tar?

Tar stool is common in gastrointestinal bleeding, such as gastric ulcer, duodenal ulcer, hemorrhagic gastritis, esophageal cancer, gastric cancer, etc. Due to the upper digestive tract, upper small intestine bleeding in the intestinal tract for a long time, red blood cells are destroyed to form black stool. If there is hematemesis and other manifestations, it can also be considered to be caused by esophageal and gastric varices. Tar stool may not be caused by disease, taking bismuth or eating animal blood products, animal liver, mulberry, etc. can also lead to tar stool. If it is suspected that the disease is caused by tarry stool, the patient can seek medical advice to do stool routine examination.