Aspartate aminotransferase mainly exists in mitochondria of myocardial cells and hepatocytes, and it can detect whether the liver is damaged. When liver cells are damaged, aspartate aminotransferase will enter the blood in large quantities, causing aspartate aminotransferase in the blood to be too high, which will cause high. The late stage of chronic hepatitis and liver disease can also cause the high level of aspartate aminotransferase.