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Non-alcoholic fatty liver disease (NAFLD) is the most common cause of liver disease in children. With increasing prevalence of childhood obesity, NAFLD is increasingly seen in children. The prevalence varies according to the population studied (race and ethnicity) and the definition of NAFLD used in the study. In Iran, the prevalence of NAFLD in obese children ranges from 50% to 55% and in the general population of children is about 17%. Most patients with NAFLD are asymptomatic. However, abdominal pain may be present in the right and upper extremity, and hepatomegaly or non-specific symptoms such as abdominal discomfort, weakness, fatigue or attention disorder may also be seen. Diagnostic methods of NAFLD include laboratory tests, biomarkers, biopsy, and imaging studies such as ultrasound, CT, MRI. There is no definitive treatment for non-alcoholic liver disease. Modification of some risk factors such as obesity, diabetes, and hyperlipidemia are often recommended, but weight loss is more beneficial. Early diagnosis of NAFLD in children and its management can reduce further complications. Therefore, in this study, we reviewed the articles published on NAFLD in children (until 2017) using electronic databases, including PubMed, ProQuest, Scopus, and Google Scholar. We reviewed the signs of NAFLD, its epidemiology, etiology, complications, laboratory findings, different diagnostic methods, treatments, and follow up procedures.

Keywords: nonalcoholic fatty liver disease, children, metabolic syndrome, steatohepatitis

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