Portal vein diameter up to 14mm is more serious. Because the normal value of the inner diameter of the portal vein is 6~10mm, if it exceeds 13mm, it is not a normal phenomenon. Portal hypertension is an obstruction of blood circulation in the portal vein due to a variety of causes. All diseases that can cause obstruction of blood flow in the portal vein can lead to it, and the common ones are cirrhosis of the liver, lymphoma, splenic tumors, chronic pancreatitis as well as schistosomiasis, acute hepatitis, chronic hepatitis, and so on. Portal vein diameter measurement test is one of the indicators to assess the severity of portal hypertension. If the diameter of the portal vein reaches 14mm, it means that the condition has become more serious. Portal vein hypertension will lead to the obstruction of blood return from the splenic vein, which in turn will lead to splenomegaly and hypersplenism, resulting in a drop in blood cells. In addition, portal hypertension is prone to opening of collateral circulation, especially esophageal and fundic varices, which may rupture and cause hemorrhage, which is life-threatening. Ascites can also occur in portal hypertension, and persistent ascites can lead to secondary infections, renal failure, and even systemic organ failure. Therefore, portal hypertension is a very serious disease that requires timely medical treatment and strict compliance with medical advice, do not leave it unchecked.