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I'm so ignorant when it comes to blood pressure. What exactly determines "good" numbers? Is it a set range, or is it within a certain range for an individual person?

At my last mw appointment, I was told that mine was "very good". I had it checked by an EMT today (free screenings at our picnic ), and HE said it was "very good". But my upper number (never remember which is called which ) was 20pts higher than last time. My lower number was 7pts higher.

Is there ANY reason to be concerned by a 20pt change, or am I just being silly if they're both considered "very good"?