There is no such thing as “what is the cause of low aspartate aminotransferase”, and low levels of this enzyme are generally meaningless. Aspartate aminotransferase, also known as glutamate aminotransferase, is mainly distributed in the heart muscle, while the rest can be distributed in other tissues such as skeletal muscle, liver and kidney, etc. In normal people, glutamate aminotransferase is relatively low, but it will be elevated if there are conditions such as acute myocardial infarction, viral hepatitis, liver cancer, skeletal muscle diseases, etc. However, there is generally no special clinical significance for a decrease in glutamate aminotransferase level, so this indicator is generally meaningless. However, there is no special clinical significance for a low level of AAT, so there is no such thing as “what causes low AAT”. It is recommended to go to the hospital and ask the doctor to make a judgment based on your condition if you have an abnormal value of aspartate aminotransferase.