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Dark blood in stool
means bleeding from high up – upper Gastro-Intestinal tract.
Red blood means the bleeding is from down below – haemorrhoids, polyp, diverticulitis
and so on..
It is an urgent indication to have Upper and/or lower GI Endoscopy
[Oesophago-Gastro-Duodeno-scopy / Colonoscopy]. You also need blood counts – to check the severity / persistence of bleeding
You should see a specialist – Gastro-enterologist.
Wishing speedy recovery