I've just started monitoring my own blood pressure, and notice that my diastolic pressure--the lower number--stays pretty much the same but my systolic pressure, the higher number, is all over the place. The systolic can easily change by five or more, up or down, when I take readings within a minute or so of each other. Why? Does this indicate a problem?
D001794:Blood Pressure / Q000502:physiology*; D018660:Blood Pressure Monitoring, Ambulatory / Q000379:methods; D006801:Humans