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People with severe anemia should be monitored for low potassium (hypokalemia), which in rare cases may lead to sudden death

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Black and tarry stools may also occur due to: Abnormal blood vessels in the esophagus, stomach, or duodenum A tear in the esophagus from violent vomiting (Mallory-Weiss tear) Blood supply being cut off to part of the intestines Inflammation of the stomach lining (gastritis) Trauma or foreign body Widened, overgrown veins (called varices) in the esophagus and stomach, commonly caused by liver cirrhosis Cancer of the esophagus, stomach, duodenum, or ampulla of Vater When to Contact a Medical Professional Contact your health care provider right away if: You notice blood or changes in the color of your stool You vomit blood You feel dizzy or lightheaded In children, a small amount of blood in the stool is most often not serious

Candidacy depends on the selected treatment, your medical history, allergies, and the clinical review completed during the visit