Blood pressure changes naturally many times a day.Your blood pressure is a reading of the force with which blood is passing through your circulatory system,all humans have a natural daily rise and fall in blood pressure that corresponds with their circadian rhythm.
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Other factors contribute to fluctuations in blood pressure, but the most common one is hypertension, a condition characterized by chronic high blood pressure. ... Other factors, such as stress, emotional upsets and food sensitivities can cause an increase in blood pressure.