Final answer:
Hypertension is the main contributing factor to stroke and kidney damage. Managing blood pressure is essential to reduce the risk of these conditions.
Step-by-step explanation:
Hypertension is the foremost contributing factor to stroke and kidney damage. High blood pressure puts more physical strain on the heart, leading to potential heart attacks, strokes, and heart failure. It can also lead to kidney failure and blindness. Managing blood pressure through lifestyle changes or medications is the best way to reduce the risk of stroke and kidney damage.