A portal vein of 12mm is high and exceeds the normal level, but it is not necessarily abnormal, it may be due to physiological reasons, and specific corresponding treatment is needed. Under normal circumstances, the diameter of the portal vein is within 10mm, if the value of the portal vein is found to be 12mm, it means that the portal vein pressure is too high, which may be due to physiological reasons, or due to their own physical abnormalities, and further examination is needed to clarify the cause of the problem. Pathologically elevated portal vein pressure is usually a manifestation of liver fibrosis and cirrhosis, such as drug-induced hepatitis, alcohol-induced hepatitis, viral hepatitis after not being controlled. Therefore, once this kind of phenomenon is found, it is necessary to take timely cause-specific treatment to restore liver function as soon as possible. After the liver function is restored, the portal vein value can be maintained at a reasonable level, while if the condition continues to worsen, it may jeopardize the life.