Abstract: Objective: To study the effect of microelementosis of the body on the development of juvenile uterine bleeding in girls. The study involved 56 girls with juvenile uterine bleeding and 27 girls, recognized as “practically” healthy at the age of 12 to 16 years. The study of ME blood composition was carried out in the Republican center for forensic examination.Thus, blood MEs are highly correlated with both clinical and laboratory parameters of juvenile uterine bleeding. The lack of such essential MEs as iodine, iron, selenium, zinc, cobalt have direct correlations with menstrual irregularities. In contrast, girls suffering from JMC show elevated levels of toxic MEs such as beryllium, aluminum, and mercury