Key Takeaways

Caffeine can cause mild elevations in blood pressure that last for as long as four hours or more.

For most adults, drinking two to three cups of coffee a day is safe, but for people with severe high blood pressure, drinking this amount can double the risk of a heart attack or stroke.

Experts recommend consuming no more than 400 mg of caffeine daily, and people with severe hypertension, anxiety, epilepsy, stomach ulcers, or pregnancy may need to cut back further.

Caffeine, found in coffee, energy drinks, colas, chocolate, and tea, can temporarily raise your blood pressure, even if you don't have pre-existing high blood pressure. The increase is due to caffeine's effect on the brain, which triggers a chain of events that causes blood vessels to narrow and systolic and diast

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