We decided to conduct this study because hypertension in childhood increases the risk of developing cardiovascular disease (such as heart attack or stroke) in adulthood, beginning to damage important structures and organs, such as blood vessels, heart, and kidneys, from an early age. There is a clear need to identify those at greatest risk of developing hypertension as early as possible and to follow them appropriately. The main objectives of the study are to describe the causes of hypertension, study the clinical-laboratory features in the patient with hypertension (such as associated symptoms or conditions, or altered blood test values), evaluate the possible involvement of the heart, and describe the overall approach to the patient with hypertension, from diagnosis (i.e., identification of the condition) to treatment.