When to worry about black stool

Iron, bismuth, and dark foods can make stool look dark. Melena is often black, sticky, tar-like, and strong-smelling because blood has been digested. The appearance cannot confirm the cause, but upper digestive bleeding can occur with an ulcer or other stomach irritation. Black stool is not a sign that a person has an anxiety condition, and anxiety should not be used to explain away physical warning signs.

Check recent foods, supplements, and medicines, and note whether the stool changes again. Contact a clinician promptly if there is no clear explanation or if the stool is tarry. Bring a full medicine list, including pain relievers and blood-thinning treatment. Do not take extra medicines to mask the symptom, and do not drive if you feel faint.

Call emergency services or go to an emergency department for fainting, severe dizziness, confusion, marked weakness, shortness of breath, severe abdominal pain, vomiting blood, or coffee-ground vomit. Seek urgent advice for repeated black stools, especially when you have ulcer history or take medicine that affects clotting. These decisions depend on red-flag symptoms, not on how common a cause may be.

Ask whether your medicine or diet could account for the colour, whether you need tests for bleeding, and what follow-up is needed. If worry about the symptom is affecting sleep or daily life after physical causes are assessed, ask whether a Mental Health Assessment is appropriate.