Why Is My Poop Black?
Article Sources
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8. Esophageal Varices and Vascular Malformation
Esophageal varices are large veins that form in the esophagus due to blocked blood flow to the liver. If they bleed, black, tarry stools may be present, along with jaundice, and the person may vomit blood and coffee ground-like vomit.13‘Esophageal Varices.’ Mayo Clinic, Mayo Foundation for Medical Education and Research, 20 Feb. 2021, www.mayoclinic.org/diseases-conditions/esophageal-varices/symptoms-causes/syc-20351538.
Sometimes, blood vessels don't form properly in the lining of the gastrointestinal tract, and they swell to a point where they may burst and bleed. If this happens, dark, tarry stools may occur. The person may also vomit blood.14‘Arteriovenous Malformations.’ Seattle Children’s Hospital, www.seattlechildrens.org/conditions/avm/.
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