What should you know about black and brown stool?

Brown stool develops as bile and food pass through the digestive system. A darker brown shade can follow changes in food or bowel speed and is not the same as black, sticky, tar-like stool. Compare the stool in good light rather than relying on a dim toilet bowl.

Black stool can result from iron or bismuth, but it can also reflect digested blood from the upper digestive tract. Gastritis and Peptic Ulcer are possible causes, and Helicobacter Pylori Infection can be associated with ulcer disease. Colour cannot confirm a diagnosis.

Think back over recent foods, medicines, and supplements, and record whether the stool was formed or loose, smooth or sticky, and brown-black or genuinely tarry. Keep a note of any stomach pain, nausea, reduced appetite, or unusual tiredness.

Contact a healthcare professional if the stool looks black without a clear explanation, returns, or occurs with other symptoms. Bring a list of medicines, particularly iron, aspirin, anti-inflammatory pain medicines, blood thinners, and bismuth products.

Seek urgent care for black tarry stool with faintness, dizziness, weakness, shortness of breath, a racing heartbeat, severe abdominal pain, or vomiting blood. Repeated black stools also need prompt assessment even if pain is absent.

Get advice sooner for a child, an older adult, pregnancy, or use of blood-thinning medicine. Do not wait for the colour to become brighter before seeking help.

Ask whether the stool appearance is consistent with a medicine effect, whether you need an examination or blood tests, and whether symptoms suggest gastritis, an ulcer, or Helicobacter Pylori Infection.