Does drinking water lower high blood pressure?

Yes, it is possible that drinking water may lower blood pressure. A Cochrane review of randomized controlled trials found that increasing fluid intake (including water) by 1.5 liters per day decreased blood pressure by an average of 2.8/1.9 mm Hg in people with hypertension. The reduction in blood pressure was larger in those who were salt-sensitive and in those who were taking medication for hypertension. Although the reduction in blood pressure was modest, it could be important for people with high blood pressure because even a small reduction in blood pressure can help to prevent heart disease and stroke.