What are common sources of caffeine, Caffeine is a mild stimulant found in tea, chocolate, coffee and also in many soft drinks. If we take too much caffeine it can cause nervousness and jitters and palpitations. It may also increase your blood pressure. The amount of caffeine in two to three cups of coffee can raise systolic pressure 3 to 14 millimeters of mercury (mm Hg) and diastolic pressure 4 to 13 mm Hg in individuals without high blood pressure.

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