What is the most significant risk factor for stroke?

• A. Hypertension
• B. Diabetes
• C. Hyperlipidemia
• D. Prior stroke

Answer: (D)

High blood pressure is the most significant risk factor for stroke because it is the strongest and most consistent predictor of stroke risk across populations. Elevated blood pressure damages vessels, accelerates atherosclerosis, and increases the likelihood of both ischemic and hemorrhagic strokes. Importantly, lowering blood pressure reduces stroke incidence markedly, making it the top target for prevention. Having had a prior stroke does raise the chance of another stroke and is a very strong predictor of recurrence, but it reflects risk after an event rather than the baseline risk of stroke in the general population. Diabetes and high cholesterol contribute to risk as well, but their impact is typically smaller than that of hypertension.