How common is black stools in peptic ulcer?

A peptic ulcer is an open sore in the stomach or the first part of the small intestine. When it bleeds, digestive juices and movement through the gut can make the stool black, sticky, and tar-like. Some people have pain, while others notice bleeding without much warning. The amount of bleeding cannot be judged safely from colour alone.

Black stool can also result from iron, dark foods, or another source of digestive bleeding. A clinician may ask about pain, vomiting, dizziness, bowel changes, and medicines such as anti-inflammatory painkillers. Assessment may include examination and tests chosen according to the symptoms.

Seek prompt medical advice for a new black or tarry stool. Take a list of all medicines and supplements, and mention any ulcer history or regular painkiller use. Avoid extra anti-inflammatory painkillers until a clinician advises you. Do not wait for pain to appear before seeking help, because an ulcer can bleed with little discomfort.

Call emergency services or attend an emergency department for fainting, severe dizziness, confusion, clammy skin, pronounced weakness, vomiting blood, or severe abdominal pain. These features may reflect a serious bleed. Repeated black stools also require urgent assessment, even when you otherwise feel stable.

Ask whether an ulcer could explain the stool, whether you need tests for bleeding or infection, which pain medicines are safer, and what symptoms should trigger emergency care.