 Hyperureosemia is a condition where there is an excessive amount of uric acid in the body. It is commonly seen in obese children and adolescents and can be associated with metabolic syndrome. In this study, it was found that 213 out of 1027 obese children and adolescents, 20.7% were affected by hyperureosemia while 65 out of these 213, 30.5% also had metabolic syndrome. This suggests that hyperureosemia may play a role in the development of metabolic syndrome in obese children and adolescents. This article was offered by Li Tang, Masaru Kubota, Ayako Nagai, and others.