Causes of Elevated Aspartate Aminotransferase (AST)
Jan 14, 2020
Source: Cainiu Health
Dr. Guo Xiheng
Introduction
Causes of elevated aspartate aminotransferase (AST):
Liver diseases, such as alcoholic liver disease, fatty liver disease, cirrhosis, and hepatocellular carcinoma; biliary tract disorders and cardiac conditions—including cholecystitis, acute myocardial infarction, myocarditis, and heart failure—may also elevate AST levels. Additionally, infectious diseases such as pneumonia, typhoid fever, and tuberculosis can lead to increased AST.
Aspartate aminotransferase (AST) is predominantly found in the liver, and to a lesser extent in skeletal muscle, kidneys, and cardiac muscle. So, what causes elevated AST levels? The following section addresses this question.
Causes of Elevated Aspartate Aminotransferase (AST)
1. Liver diseases
Since AST is primarily distributed in the liver, various hepatic disorders may lead to elevated AST levels—for example, alcoholic liver disease, fatty liver disease, cirrhosis, and hepatocellular carcinoma.
2. Biliary tract diseases
During acute episodes of cholecystitis or cholelithiasis, patients commonly present with fever, abdominal pain, nausea, vomiting, jaundice, elevated serum bilirubin, and increased AST levels. Once inflammation is controlled, AST levels typically normalize. Diagnostic imaging—such as ultrasound or X-ray—is recommended for further evaluation.
3. Cardiac diseases
In addition to the liver, AST is also present in cardiac muscle. Thus, elevated AST may indicate underlying cardiac pathology, including acute myocardial infarction, myocarditis, and heart failure—all of which can cause increased AST levels.
4. Infectious diseases
Certain infectious diseases—including pneumonia, typhoid fever, tuberculosis, and infectious mononucleosis—may also result in elevated AST levels. However, each of these conditions presents with characteristic clinical features and can be definitively diagnosed through laboratory testing. Additionally, elevated AST may occur following acute soft-tissue injury, intense physical exercise, or during pregnancy.
The above outlines the primary causes of elevated AST. These include hepatic disorders such as alcoholic liver disease, fatty liver disease, cirrhosis, and hepatocellular carcinoma; biliary tract diseases (e.g., cholecystitis); and cardiac conditions (e.g., acute myocardial infarction, myocarditis, and heart failure). Furthermore, infectious diseases—including pneumonia, typhoid fever, and tuberculosis—can also elevate AST levels. We hope this information proves helpful to you.
