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Hypertension, or high blood pressure, is recognized as the greatest modifiable risk factor for stroke due to its direct impact on the cardiovascular system and the increased pressure it places on blood vessels. Elevated blood pressure can lead to damage in the arteries, making them more likely to become narrowed or blocked, which can result in an ischemic stroke. Additionally, hypertension can contribute to the development of atherosclerosis, where plaque builds up in the arteries, further increasing stroke risk.

Effective management and reduction of hypertension through lifestyle changes such as a healthy diet, regular exercise, and if necessary, medication can significantly lower an individual’s risk of experiencing a stroke. According to public health guidelines, keeping blood pressure within a normal range is critical for stroke prevention. Other factors like smoking, excess weight, and lack of exercise are important as well, but they are often considered secondary to the direct effects of hypertension.