High alanine aminotransferase and normal alanine aminotransferase may be related to alcohol consumption, medication and viral infections. 1. Alcohol consumption: Frequent or heavy drinking will cause some degree of damage to the liver, which may lead to high ALT. 2. Taking medication: If the patient has recently taken some medications such as rifampicin, isoniazid, etc., it may cause liver damage, which may increase the value of ALT. 3. Viral infections: There are many reasons for the elevation of alanine aminotransferase, and the common reasons include viral infections, such as hepatitis B virus, hepatitis C virus, CMV, EBV infections and so on. High alanine aminotransferase and normal alanine aminotransferase may have other causes, such as autoimmune hepatitis, etc. You should consult the doctor in time to clarify the specific causes and take appropriate treatment if necessary. Blind self-medication should be avoided.