The normal value of portal vein pressure is about 1.73-2.35kPa, i.e. 13-24cm water column, if it exceeds the specified range, it indicates portal hypertension. Portal hypertension is an emergency or critical condition of the digestive system with complex etiology, such as cirrhosis, hepatocellular carcinoma and hepatic cavernous changes, which can cause portal hypertension. High portal vein pressure may cause esophagogastric fundic varices, gastrointestinal hemorrhage, and in severe cases, may lead to hemorrhagic shock, which in turn may be life-threatening. In addition, portal hypertension may affect the perfusion or function of the liver and may be accompanied by related clinical symptoms, such as yellowing of the skin and mucous membranes, enlargement of the liver, or even a large amount of abdominal fluid. In the event of critical conditions such as portal hypertension, the patient should be treated under the guidance of a medical professional.