Transaminases 99U/L are often indicative of liver damage, and need to be combined with symptoms and other test results to determine whether they are serious. Transaminase 99U/L suggests abnormal liver function, mostly due to liver cell damage resulting in the release of enzymes, and the degree of elevation is related to the severity of the disease, which may be caused by poor lifestyle habits such as staying up late, sleep deprivation, excessive smoking and drinking, etc., or fatty liver, alcoholic hepatitis, viral hepatitis and other reasons. If the patient develops uncomfortable symptoms such as anorexia, abdominal pain, or the presence of viral infection is found during examination, it is mostly more serious. If the patient has a transaminase of 99U/L, it is recommended to consult a doctor in a timely manner, under the guidance of the doctor, improve the relevant examination, clarify the cause of the disease, and symptomatic treatment.