Although caffeine is generally regarded to be a relatively safe drug when consumed in moderate amounts, research suggests one of the following may be a health risk associated with caffeine intake via coffee or tea.

Question

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Caffeine can cause a short, but dramatic increase in your blood pressure, even if you don't have high blood pressure. It's unclear what causes this spike in blood pressure. Some researchers believe that caffeine could block a hormone that helps keep your arteries widened.

Although Caffeine Is Generally Regarded to Be a Relatively Safe