Harvard Heart Letter

Why is the blood pressure in my right arm different from that of my left?

Ask the doctor Q. Why are the blood pressure readings in my right and left arm different even when they’re taken within a minute or two of each other? A. The answer depends on how big of a difference you’re talking about. A difference of just a few points (that is, a few millimeters of mercury, or mm Hg) is nothing to worry about. It’s actually quite normal, even when…

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