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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 .
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]
Blood may be observed in vomit or in altered form as black stool. Depending on the amount of the blood loss, symptoms may include shock. Upper gastrointestinal bleeding can be caused by peptic ulcers, gastric erosions, esophageal varices, and rarer causes such as gastric cancer.
Unintended weight loss/lack of appetite—this could indicate serious illness when coupled with pale stools and warrants medical attention. Severe diarrhea with signs of dehydration.
2. Alleviates Hunger. Metformin improves how well your cells respond to insulin. This helps regulate your blood sugar levels and manage spikes in insulin that can trigger hunger and food cravings.
Metformin can also cause a vitamin B12 deficiency, which may be linked with anemia. Stopping the medication or starting vitamin B12 supplementation appears to reverse this. Seek medical advice if ...
Blood in stool looks different depending on how early it enters the digestive tract—and thus how much digestive action it has been exposed to—and how much there is. The term can refer either to melena, with a black appearance, typically originating from upper gastrointestinal bleeding; or to hematochezia, with a red color, typically originating from lower gastrointestinal bleeding. [6]
There’s no best time to take metformin for weight loss or type 2 diabetes (or any other condition). But taking it at the same time each day can help you stay consistent and avoid missing or ...
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