To investigate, researchers looked at data from six previous studies that included more than 170,000 people in total. For each study, scientists surveyed the participants to find out how many cups of coffee they drank each day and then followed them for up to 33 years.
Over the study period, slightly more than one in five participants eventually developed high blood pressure.
But the chance of being diagnosed with the condition was no different between people who said they chugged more than five cups of coffee per day and those who drank very little.
More studies will be needed on the subject, as researchers could not compare the effect of drinking caffeinated versus decaffeinated coffee, since some of the studies they analyzed had participants report both together or only asked about caffeinated coffee.
Researchers are keen to point out that the study does not say there is no risk to drinking lots of coffee, and more data would be needed to draw a firm conclusion.
The findings were published in The American Journal of Clinical Nutrition.
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