Abstract. The study aimed to study the content of toxic and essential microelements in the hair of children with cardiomyopathy living in areas with different climatic and geographical conditions. 96 hair samples of children with cardiomyopathy living in different environmental conditions were examined. The research results showed that the problem of microelements is typical not only for the Aral Sea region but also for other regions: deficit and/or deficiency of 2 or more vital microelements is found in 96% of children with CMP. The frequency of trace elements in children in all regions was high in Ca, Cr, Co, Cu, He and Zn. Children living in the Aral Sea region were characterized by excessive levels of manganese, bromine, and iodine; children living in relatively advantaged regions were characterized by reliably high levels of potassium, chlorine, and iodine.