More details regarding your symptoms, diet, weight is required. Is it associated with stomach discomfort? Is it associated with pain while in toilet? Commonly black poop happens when there is some bleeding is upper parts of our gut tube. Other causes can be diet, certain medications etc. Need to rule out previous history of tummy acidity/ulcers.
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discuss your details on practo or ask your Qs on wh@tspp 9438/ 45o/ 966 (Thomson Clinic)