Black stool can result from dietary changes to even revealing a serious medical condition, so it’s important to pay attention if you’re seeing black after a bathroom trip. Along with a change in color, black stool may also be tarry in texture and more foul-smelling, which is a clear signal of a serious underlying gastrointestinal problem.
False melena: False melena is black tarry stool caused by food, supplements, medications, or minerals. Iron supplements can trigger false melena, along with foods that are blue, black, or green in color. Some examples of factors that can trigger false melena include black licorice, blueberries, iron supplements, lead, and bismuth.
Melena: This is a result of upper gastrointestinal bleeding in the esophagus, stomach, or small intestine. Other causes of melena include bleeding ulcer, gastritis, esophageal varices, and Mallory-Weiss tear – this is a tear of the mucus membrane that connects the esophagus and stomach.
Hematochezia: This is the passage of black tarry stool when bleeding is present in the parts of lower digestive tract, such as the colon, rectum, or anus.
Other causes: Other causes of maroon or black-colored stool may result from anal fissures, cut-off blood supply to the intestines, polyps or cancer, diverticulosis, hemorrhoids, inflammatory bowel disease, infection of the intestines, and trauma or foreign bodies.
Signs and symptoms of black poop often relate to its underlying cause. Here is a list of potential signs and symptoms that may accompany black tarry poop:
To properly diagnose the underlying cause of your black tarry stool your doctor will do a complete medical examination. They will run blood tests and imaging scans to determine any infection, blockages, or anything else that can contribute to black tarry stool.
A colonoscopy or endoscopy may also be recommended to have a better look at the stomach and colon to check for any tears, polyps, or other sources of bleeding.
Treatment for black tarry stool depends on the underlying cause. Some possible treatments for black tarry stool include antibiotics, acid-reducing medications, surgery for abnormal veins, removal of polyps, or simple diet changes.
If black tarry stool is caused by your diet, you may wish avoid foods that are blue, black, or green in color. You will also want to increase your fiber intake to reduce tears in the colon. Ingest more raspberries, pears, whole grains, beans, and artichokes.
For some conditions, a high-fiber diet is not recommended. Your doctor will help you find the best way to eat based on your unique needs.