What is the foremost contributing factor to stroke and kidney damage?

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Elevated blood pressure is the strongest single contributor to both stroke and kidney damage. When blood pressure runs high over time, it damages the lining of blood vessels and accelerates atherosclerosis, increasing the risk of clots and vessel rupture in the brain, which can lead to stroke. In the kidneys, the same high pressure injures the tiny filtering units (glomeruli) and the blood vessels, causing hypertensive nephrosclerosis, reduced filtration, and eventual chronic kidney disease. Controlling blood pressure can markedly reduce the chances of stroke and slow kidney deterioration.

Diabetes and smoking contribute to vascular risk and kidney damage, and obesity often worsens risk through multiple pathways, including raising blood pressure and promoting atherosclerosis, but none are as direct and impactful as sustained hypertension itself.