Black stools are a sign of what disease?

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Hello doctor. For the past few days, I have had black stools, fever and headache. Doctor tell me what is the cause of my condition? Please advise, thank you.
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Hello!
Black stools can be a sign of bleeding in the gastrointestinal tract, this is a gastrointestinal emergency.
You should go to a medical facility soon so that the doctor can better determine if the black stool is due to gastrointestinal bleeding. Your doctor will give you laboratory tests to diagnose your condition and give you the right treatment plan.
You can visit the hospitals of Vinmec Health System to be consulted more thoroughly by experienced and qualified doctors. Wish you all the best!
Thank you for your question to Vinmec Health System. Best regards!
Answered by Master, Doctor Vu Van Quan - Gastroenterologist - Department of General Surgery & Anesthesia - Vinmec Hai Phong International General Hospital.