Dark stool color may be due to eating darker-colored food, or consumption of certain drugs, may also be due to disease causes, the specific causes and treatment methods are as follows: 1, physiological factors: eating dark-colored food, such as black sesame, spinach, animal offal, etc., can lead to dark stool color. There are also some people taking iron, bismuth and other drugs, there will be a dark stool, lusterless black stool, this is a normal phenomenon, usually no special treatment, after stopping eating stool color can return to normal; 2, pathological factors: if there is gastrointestinal bleeding can lead to dark stool, tar-like stool, soft and lustrous. Need to promptly seek medical advice to clarify the cause, determine whether it is due to gastric ulcer, or gastrointestinal tumors or other diseases caused by gastrointestinal bleeding, according to the specific cause to take targeted treatment measures. For example, patients with gastric ulcer need to take H2 receptor antagonists, as well as drugs to protect the gastric mucosa, and endoscopic hemostasis or surgical treatment if the bleeding is severe; if it is a gastrointestinal tumor, surgical treatment needs to be given, supplemented by radiotherapy and targeted therapy. Regardless of the cause of dark colored stool, patients should go to the hospital promptly and have the doctor determine the specific cause after examination. If a patient has dark stool color along with dizziness, vomiting blood, severe abdominal pain, pale face and other symptoms, it is mostly considered as gastrointestinal hemorrhage and should be promptly treated without delay to avoid life-threatening.