What Causes Dark Stool? 11 Possible Causes You Should Know

Ulcer

Ulcers are sores generally found on stomach linings and may cause melena or bleeding. Contrary to what some might think, stomach ulcers aren’t typically caused by spicy food or stress. Although that isn’t to say they can’t aggravate existing ulcers because they certainly can. In actuality, this condition usually stems from bacterial infections called Helicobacter pylori. Another common cause for the development of ulcers is pain medication’s long-term use, referred to as NSAID or non-steroidal anti-inflammatory drugs. This can include many of the most common over-the-counter medications, such as aspirin, naproxen, sodium, and ibuprofen.

NSAIDs can irritate and weaken the stomach’s lining and its ability to resist acid effectively. Therefore, these non-steroidal anti-inflammatory drugs may also have adverse reactions in people with ulcerative colitis and Crohn’s disease, which are conditions that cause inflammation and ulcers in the gastrointestinal tract. Therefore, avoid taking any NSAIDs if dark stool occurs unless recommended or prescribed by a doctor.