Causes of Elevated Aspartate Aminotransferase (AST)
Disease description:
I suspect my liver is problematic—I’m a long-time heavy drinker. During a routine physical examination, my aspartate aminotransferase (AST) level was found to be elevated. I’d like to ask my doctor: What are the possible causes of an elevated AST level?
Doctor's answer (1)
Dr. Guo Xiheng
Elevated aspartate aminotransferase (AST) levels typically indicate damage to the liver or other tissues. This elevation can stem from various causes. Liver diseases—such as viral hepatitis (types A, B, and C), alcoholic liver disease, and non-alcoholic fatty liver disease—are common causes of elevated AST. When hepatocytes are injured, AST is released into the bloodstream, resulting in increased serum levels. Drug-induced liver injury may also elevate AST, particularly with prolonged or high-dose use of certain medications. Additionally, AST levels may rise following myocardial or skeletal muscle injury—for example, in acute myocardial infarction. Determining the underlying cause of elevated AST requires comprehensive evaluation, including patient history, clinical presentation, and laboratory testing, followed by appropriate therapeutic interventions. If you have concerns or if symptoms persist or worsen, seek medical attention promptly.
