There are many reasons for the elevation of alanine aminotransferase, ranging from physiological reasons, such as strenuous exercise, exertion, etc., to pathologic reasons, which are commonly found in liver diseases. 1. Physiological causes: Strenuous exercise, overwork, eating greasy food, drinking alcohol, etc. may lead to a mild increase in alanine aminotransferase. Elevation of alanine aminotransferase due to physiological causes usually has no obvious symptoms, and can return to normal after removing the triggers and taking sufficient rest. 2. Pathological causes: commonly found in liver diseases, such as viral hepatitis, alcoholic hepatitis, fatty liver, drug-induced hepatitis, liver cirrhosis, liver cancer and so on. In addition, acute myocardial infarction, myocarditis, pulmonary infarction, pneumonia, typhoid fever, malaria, etc. may also lead to alanine aminotransferase elevation. In conclusion, there are many reasons for alanine aminotransferase elevation, if you have alanine aminotransferase elevation, you need to go to the hospital in a timely manner, to find out the causes of elevation, and take appropriate treatment, you should avoid self-diagnosis and treatment.