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The real reason your stool turned black overnight: The warning signs of Melena you should never ignore

Sudden black, tar-like stools, medically termed melena, often signal internal bleeding in the stomach or upper intestine, according to a 2021 study. While some foods or supplements can cause temporary darkening, this texture and smell usually indicate a serious issue like ulcers or inflammation. Prompt medical evaluation is crucial, especially with accompanying symptoms like dizziness or vomiting blood.