Alcohol consumption is likely to cause an elevation of the enzyme alanine aminotransferase. Normally, the normal range of fasting ALT is 5~40 U/L, which may vary due to the different testing reagents used by different medical institutions. The main component of alcohol is ethanol, which is mainly metabolized in the liver, through the liver’s ethanol dehydrogenase metabolism to acetaldehyde, acetaldehyde by acetaldehyde dehydrogenase metabolism to acetic acid, the whole metabolism process will generate reactive oxygen species, if a large amount of long-term drinking or one-time intake of a large amount of alcohol, it will lead to liver damage, resulting in the elevation of alanine aminotransferase. In addition, the combination of acetaldehyde and protein can form acetaldehyde-protein complex, which not only has direct damage to liver cells, but also induces humoral immunity and cellular immunity, resulting in immune damage to liver cells, which can also lead to the elevation of ALT. If the test results of AAT is abnormal, it is recommended to go to the regular hospital in time, after clarifying the cause of the disease, under the guidance of the doctor to carry out targeted treatment or therapy.