Nasrin Milani - Assistant Professor, Department of Internal Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
Mohamad Sajjadi-Manesh - Family Medicine Specialist, Department of Family Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
Ehsan Mosa Farkhani - PhD Candidate in Epidemiology, Khorasan Razavi Province Health Center, Mashhad University of Medical Sciences, Mashhad, Iran
Kamila Hashemzadeh - Assistant Professor of Rheumatology, Rheumatic Diseases Research Center, Mashhad University of Medical sciences, Mashhad, Iran
Ali Taghipour - Associate Professor, Department of Epidemiology & Biostatistics, School of Health, Social Determinants of Health Research Center, Cancer Research Center, Mashhad University of Medical Sciences, Mashhad, Iran

Introduction: Hypertension (HTN) or high blood pressure is one of the deadliest and most chronic disorders in the world. Although some examinations have demonstrated an indirect relationship between 25-hydroxyvitamin D serum level and blood pressure, there have been new exchanges of views with respect to the role of low vitamin D levels in hypertension. This study aims to find out the relationship between hypertension and regular consumption of vitamin D using secondary data (SINA system).Method and material: A case-control study was carried out on secondary data (SINA system) among people, aged 30 years old or older, registered in 2017-2018. A sample size of 1,500 patients was used comprising of 500 patients with hypertension as the case group and 1,000 people without history of hypertension as the control group. The population was selected randomly. High blood pressure diagnostic criteria were considered in accordance with the clinical guidelines of the 7th National Joint Committee. Data were analyzed using SPSS 22 software.Results: Regular consumption of vitamin D was found out to be a protective factor for hypertension with a significant level (P value <0.05) and [OR= 0.421 (0.353- 0.505)].Conclusion: By identifying hypertension risk factors, taking measures to prevent it would be more practical and the risk of hypertension can be reduced. A large body of epidemiological and experimental evidence suggests that vitamin D deficiency may promote hypertension. This investigation proves that vitamin D supplementation could be a simple intervention to reduce the risk of progression of increased blood pressure due to its protective effect on blood pressure.

hypertension, vitamin D, risk factor