Blood pressure is a strong predictor of brain health and high blood pressure and is a significant risk factor for stroke. About three in every four people (77%) who have a first stroke have blood pressure higher than 140/90 mm Hg. A 10-mm Hg drop in systolic blood pressure (the top number in your reading), or a 5mmHg drop in diastolic pressure (bottom number) can cut your risk of stroke death in half. So, get your blood pressure checked regularly and work with your healthcare provider to get high blood pressure under control.