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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.
Cause of Bleeding Varices. Portal hypertension is an increase in the pressure within the portal vein (the vein that carries blood from the digestive organs to the liver). It's often due to scarring of the liver, or cirrhosis.