Introduction: Arterial hypertension is the major cause of morbidity and mortality in our country, as well as in the rest of the developed world, and represents a major public health issue. Purpose: The purpose of this thesis was to theoretically present arterial hypertension, the risk factors and the treatment with emphasis on the presentation of DASH diet as a way of proper nutrition for people with high blood pressure. The thesis also intended to define the role of nurses in the process of managing patients with high blood pressure. Methods: A descriptive work method was used for conducting the thesis. An overview of technical and scientific literature was made. Data was obtained by reviewing electronic databases, such as COBISS (limited to the Faculty of Health Sciences Library), foreign databases (MEDLINE, CINAHL, EBSCOhost, Springer Link) and via the Digital Library of the University of Ljubljana. Results: The research showed that all the factors of cardiovascular disease had been well researched and that the authors agreed upon the undertaken treatment measures. Prompt treatment with drugs was necessary for people with very high blood pressure, however, in the majority of cases the treatment started without medication. It had been proven that DASH diet lowers blood pressure. Within two months the diet had lowered the systolic blood pressure for 10 mm Hg and diastolic blood pressure for 5 mm Hg. This reduction in blood pressure could be compared with the reduction effect achieved with drugs. Discussion and conclusion: People begin to change their behavioral pattern mostly only as the disease already appears. Arterial hypertension cannot be cured, but an individual can learn how to live with it and keep it under control. The best and healthiest way to control hypertension is a healthy lifestyle. A chronic disease, such as arterial hypertension, requires a lifelong treatment. Educational work is a crucial part in the process of a lifelong health care. In reference clinics the outpatient health care and health education are implemented by graduate nurses. With their professional practice they improve the work quality and patient satisfaction.