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Watermelon stomach is a condition in which the lining of the stomach bleeds, causing it to look like the characteristic stripes of a watermelon when viewed by endoscopy. Signs and symptoms of Watermelon stomach include blood in the stool, hematemesis (vomiting blood) and anemia. The exact cause of Watermelon stomach is unknown; however, it is often diagnosed in people with other chronic (long-term) conditions such as cirrhosis (scarring of the liver and poor liver function), autoimmune disease, systemic sclerosis, and CREST syndrome.