ALT, also known as alanine aminotransferase, is an indicator for detecting impaired liver function. High alanine aminotransferase may be caused by liver cell damage, which may be due to hepatitis, alcohol consumption, medication, etc.; it may also be caused by irregular diet, prolonged late-night and other factors. 1. Hepatitis: such as steatohepatitis, alcoholic hepatitis, autoimmune hepatitis, viral hepatitis, etc., all of which can cause liver cell damage and lead to high ALT. 2. Alcohol consumption: long-term and large amount of alcohol consumption, because ethanol can damage liver cells, so the phenomenon of high ASTE can occur. 3. Drugs: Drugs such as antibiotics and non-steroidal anti-inflammatory drugs can produce components that have adverse effects on liver cells during metabolism in the body, leading to liver cell damage and this situation. In addition, high alanine aminotransferase can also be seen in other situations, such as irregular diet, stay up late for a long time and so on. It is recommended that patients go to the hospital in time, after clarifying the cause of the disease, under the guidance of the doctor for treatment.