Does caffeine increase blood pressure?

The effect of caffeine on blood pressure varies considerably. For many, even heavy use doesn’t raise it. But for some, even a small amount can significantly raise the systolic blood pressure (the top number). Most studies have been done on regular coffee. Higher consumption over a short period of time is most predictive of a spike in blood pressure. Otherwise research results looking at longer term effects of daily moderate coffee consumption have shown different results, even in people with known hypertension.