Hypertension is a well known disease in a recent time and the only way for detecting it is by measurement of the blood pressure. Alot of factors may affect such measurement and in our study we evaluate the effect of hard work and stress on blood pressure measurement. Hard work has been associated with an increased risk for heart and cardiovascular  disease. In this study we took (100) participants male with no any disease, age ranging from (20 until 50) year and put them under observation and checking their blood pressure and heart rate and heart rate variability two days a week after doing hard work and one non work day every week for four weeks. Chronic hard work stress was defined on the base of synergist model, as: (1) high imbalance, a combination of high effort and low reward at work, or (2) high over commitment, an exhaustive work –related coping style indexing the inability to unwind. Hard work as it exert its effect on heart rate and blood pressure it means that indirectly work on more of one risk factors of heart diseases, and this hard work will make plaques inside the blood vessels more vulnerable for rupture and that person who do hard work more prone to develop heart disease. All the participants in this study show more elevation in blood pressure and as a consequence increased prevalence of heart and cardiovascular disease. The results from this study suggests that the detrimental effects of hard work are partly mediated by increased heart rate reactivity to a stressful work day, an increase in systolic blood pressure level.