Which of the following is a common risk factor for ischemic stroke?

Hypertension, or high blood pressure, is a significant risk factor for ischemic stroke because it places excessive strain on the arteries, leading to damage over time. This damage can result in the formation of blood clots or the buildup of fatty deposits within the arteries, both of which can obstruct blood flow to the brain. When blood flow is diminished or interrupted due to these blockages, it can lead to an ischemic stroke, where brain tissue is starved of oxygen and nutrients.

While dehydration, high cholesterol, and smoking can also contribute to stroke risk, they typically play a secondary role compared to hypertension, which is one of the most well-established and prevalent contributors to the incidence of ischemic strokes.