Researchers have found indulging in, rather than abstaining from, tea and coffee can reduce blood pressure and better your overall health. It's unclear what causes this spike in blood pressure. Caffeine can cause a short, but dramatic increase in your blood pressure, even if you don't have high blood pressure. Caffeine From Tea And Coffee Lowers Blood Pressure: Researchers Say 4 Cups A Day Does The Deed. If you have low blood pressure, drinking caffeinated coffee may temporarily elevate your blood pressure. The higher the caffeine content of the coffee, the greater the effect on blood pressure. May 17, 2002 -- The caffeine jolt of a java fix may cause a jump in blood pressure-- a particular problem in people who already have high blood … Previous studies on this topic have various diverse results. Coffee is one of the world’s most popular beverages, but it has been blamed for causing high blood pressure. The effects are short-lived, but for a few hours after finishing your caffeinated beverage of choice, your blood pressure will be higher than normal. The increase lessens for coffee drinkers who are more acclimated to the drink. Although studies indicate drinking coffee in moderation has little effect on long-term blood pressure. As the effects are so short-lived, for the general population regular coffee consumption does not raise your blood pressure long-term, nor does it appear to increase your risk of cardiovascular health problems. Caffeine is a vasoconstrictor, which means that it decreases the size of blood vessels and can raise blood pressure. Coffee can raise your blood pressure short-term, especially if you are not a habitual coffee drinker. Not to worry—one or two cups in the morning does not cause any long-term problems with blood pressure … Some studies have shown a small and short-lasting increase in blood pressure after consuming caffeinated beverages such as coffee or tea. Some researchers believe that caffeine could block a hormone that helps keep your arteries widened. Coffee_circle, CC By-ND 2.0. Studies show that coffee increases blood pressure for up to 3 hours (because of the caffeine), after which it returns back down.