Final answer:
Hypertension or high blood pressure is the leading cause of stroke. Atherosclerosis is also a factor. Keeping blood pressure within the normal range is important for reducing the risk of stroke.
Step-by-step explanation:
The leading cause of stroke is hypertension or high blood pressure. Atherosclerosis in the arteries of the brain can also lead to a stroke. Other risk factors for stroke include old age, having a previous stroke, diabetes, high cholesterol, and smoking. The best way to reduce the risk of stroke is to keep blood pressure within the normal range.