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From there, blood makes its way to the Vena cava, the largest vein in the body to return to the heart. Portal hypertension describes elevated pressure within the portal system, including the portal vein and the tributary veins that drain into it.
1 High pressures within blood vessels of the liver occur in a majority of people who have cirrhosis. 2  Cirrhosis is the most common cause of portal hypertension in the United States. 3  Portal hypertension may cause bleeding into the intestines and fluid accumulation throughout the body.