Dark stools after having a stent can be caused by dietary factors, medications, ulcerative diseases, tumors, and blood disorders. The causes are different and the treatments are different. 1. Dietary factors: If the color of stool becomes black due to eating pig’s blood, duck’s blood, etc., this is generally normal, and the color of stool will gradually return to normal after stopping eating blood products. 2. Drug factors: for example, taking iron, bismuth potassium citrate, etc. can appear black stool. After stopping the medication, the color of stool will return to normal. In addition, after stenting, it is usually necessary to take double-anti-drugs, that is, anticoagulants combined with antiplatelet aggregation drugs or use two kinds of antiplatelet aggregation drugs. If there is a black stool, it is likely to be digestive bleeding, and the routine stool + occult blood test will be performed, and consideration will be given to stopping the drug and changing the drug. If you are taking aspirin combined with clopidogrel bisulfate double resistance to cause gastrointestinal bleeding, this time you can first stop aspirin, continue to take clopidogrel bisulfate, and add to protect the gastric mucosa of the drug, such as pantoprazole, continue to observe the situation. 3. Ulcerative diseases: patients with gastric ulcers, duodenal ulcers, stress ulcers, esophageal ulcers and other diseases, under the stimulation of drugs can cause upper gastrointestinal bleeding, resulting in black stool. Gastroscopy is needed to clarify the diagnosis, stop anticoagulants or antiplatelet aggregation drugs, and give acid-suppressing gastric treatment, such as omeprazole and magnesium aluminum carbonate. There are many reasons for black stools after stenting, so you need to go to the hospital, explain to the doctor in detail, and take the next step according to the doctor’s advice.