Hypertension begins in childhood and adolescence. Elevated blood pressure contributes to the early development of cardiovascular disease. It is important to develop guidelines on the optimal detection and management of arterial hypertension in this age group. Until recently general practitioners, paediatricians and other healthcare providers based on American guidelines published in 2004 by National High Blood Pressure Education Program Working Group on High Blood Pressure in Children and Adolescents in “Pediatrics” (Task Force). This guidelines presented hypertension definition in children and adolescents, determined methods of blood pressure measurement, diagnostic range and methods of treatment. In 2009 European Society of Hypertension recommendations on management of high blood pressure in children and adolescents were published in “Journal of Hypertension”. In Poland results of OLAF project were published in 2010. They present percentile values of blood pressure, height and weight as well as BMI, of Polish population aged 7-18 years. In United States, although they did not published another Task Force report yet, we can find new modifications of guidelines in recently published literature. We present here current knowledge about applicable recommendations.