A study found that patients with stage 1 hypertension who received chiropractic adjustments saw a reduction in both systolic and diastolic blood pressure, with systolic decreasing by an average of 17 points and diastolic decreasing by 10 points. The study authors speculate that vertebral subluxations in the upper spine restrict blood flow to the brainstem, causing hypertension. Other research links chiropractic adjustments to short-term reductions in blood pressure within 10 minutes of treatment and found that adjustments to the upper back may lower blood pressure. Chiropractic care focuses not just on adjustments but promoting a healthy lifestyle to prevent hypertension through diet, exercise, managing stress, and other factors.