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“The tarry or stickiness of the stool and the smell are what differentiate true GI bleeding from other causes such as iron supplements, dark foods, and bismuth-containing medications,” he adds.
Melena is a form of blood in stool which refers to the dark black, tarry feces that are commonly associated with upper gastrointestinal bleeding. [1] The black color and characteristic strong odor are caused by hemoglobin in the blood being altered by digestive enzymes and intestinal bacteria. [2]
For instance, Pepto Bismol can temporarily turn stools black, as can iron supplements. ... Medications that can cause diarrhea as a side effect, like metformin, Lexapro (escitalopram), Nyquil, ...
Bismuth sulfide is a highly insoluble black salt, and the discoloration seen is temporary and harmless. Long-term use (more than six weeks) may lead to accumulation and toxicity. [8] High daily intake over a period of months can possibly cause severe fatigue, weakness and neurological symptoms that reverse with discontinuation. [9]
It is also one of the medications that can cause toxic epidermal necrolysis or Stevens–Johnson syndrome. [8] The pediatric version of cefdinir can bind to iron in the digestive tract; in rare cases, this causes rust or red discoloration of the stool. Blood typically appears dark brown or black in stool, and testing may confirm which is present.
Bleeding − bloody or black, tar-like stools, red or dark brown urine, vomiting blood or brown material that looks like coffee grounds, small, red or purple spots on skin, unusual bleeding or ...
Digested blood from the upper gastrointestinal tract may appear black rather than red, resulting in "coffee ground" vomit or melena. [2] Other signs and symptoms include feeling tired, dizziness, and pale skin color. [18] A number of foods and medications can turn the stool either red or black in the absence of bleeding. [2]
Along with smelly stool, other symptoms include watery stool, diarrhea, abdominal cramps, and abnormal heartbeat, per the Wisconsin Department of Health Services. 8. You have cancer.