In general, normal stools are yellow soft stools. If black stool may occur is related to the following factors: 1. 1 time a day stool is generally yellow soft stool. But the constipated patient because several days without stool, stool out after the dry, hard ball-like nature, at first glance is black, but sometimes even dark brown. Go to the laboratory and completely normal, which is actually a manifestation of constipation; 2, recently eat shabu-shabu or eat pig’s blood, sheep’s blood, and blood things eaten after the stool color will be completely black, go to the laboratory also no problem; 3, usually eaten to kill H. pylori drugs, such as colloidal pectin bismuth, or the treatment of gastric pain gastric BIC, will also appear black stool, no serious problems, the laboratory can be checked; 4, the most The main thing is gastrointestinal bleeding, there will be tarry black stool, which is an abnormal situation. Therefore, the first thing to determine is which kind of black stool is present. Because of the black stool, some patients will be combined with stomach pain, stomach acid, heartburn and other symptoms, and timely medical care will be more timely detection of abnormal problems. However, some patients, such as patients with vascular disease, take aspirin, which is a painkiller, and do not feel pain after eating it, but black stool has appeared for several days, and they do not feel uncomfortable to go to the hospital, and it is easy to delay the disease. Therefore, once you see black stool, the most important pathological condition is gastrointestinal bleeding, you should promptly go to the laboratory for stool testing, hematocrit testing, and even hospitalization of the patient to fast.