What Are Symptoms of Internal Bleeding in the Stomach?

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Symptoms of internal bleeding in the stomach include vomiting bright red blood and vomitus that looks like coffee grounds, according to WebMD, as is passing black, tarry stools, otherwise known as melena, as stated on Medicine Net. The blood turns black because of chemical changes that take place as it makes its way through the gastro-intensitinal tract, according to Healthgrades, which states that blood may not be visible at all.