Blood pressure changes frequently throughout the day. Things that can make blood pressure change within a few minutes include:
Posture
Amount of tension
Level of exercise
Nicotine use.
It's easy to see why even normal blood pressure can fluctuate within a certain range every day. Given these normal fluctuations, it's best to use more than one blood pressure reading to figure out your average blood pressure.
Blood pressure can also run high or low in families. It's important to look at your overall health, lifestyle, diet, and family history when comparing your blood pressure to what's considered "normal blood pressure." These factors may cause you to have a higher or lower blood pressure than what's considered normal.
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