Seems like your blood pressure usually is normal. Why you on occation have a high systolic reading is hard to say, the difference between systolic and diastolic tend to increase from age 50, but more often the cause is pure stress and anxiety. Are you anxious/expecting the worst when measuring your blood pressure?
Maybe you should ask your doctor for a 24 hour monitoring, if it is normal, you would easier to be able to not measure your blood pressure? If there are any abnormalities, you could get them treated.
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