High alanine aminotransferase in young children may be caused by viral hepatitis, drug-induced liver damage and hepatomegaly. 1. Viral hepatitis: young children may be infected with hepatitis B, hepatitis C, hepatitis A and so on. There are also other hepatophilic viruses, such as EBV, Coxsackie virus, etc. These viruses have the condition of destroying the liver, which will lead to the elevation of ALT. 2. Pharmacologic liver damage: Some medications can cause elevated aminotransferases in young children, and the use of liver-damaging drugs needs to be stopped in a timely manner. 3. Hepatomegaly: It is a metabolic disease, which is caused by abnormal metabolism of copper by the liver, and can also lead to elevation of ASTE in young children. When the phenomenon of high ghrelin in young children, parents are advised to take their children to the hospital for examination and actively cooperate with the doctor for treatment.