Does coffee raise one's blood presure signifigantly or just moderately?

Temporary rise in b: Coffee affects individuals differently. Some are affected by it, others not. In any case it causes a temporary rise in blood pressure but does not cause long term hypertension.

It's the caffeine.: Caffeine in a cup of coffee acts as a stimulant and does have the potential to raise your blood pressure. How much your blood pressure rises depends on whether or not you have high blood pressure already or are prone to such.