According to the American Heart Association, blood pressure fluctuations within a certain range are considered normal.
For example, during non-active periods, a normal range of systolic (upper) blood pressure is anything less than 120 mm Hg. Systolic blood pressure that moves into the 120 to 129 mm Hg range is considered elevated.
A normal diastolic (lower) number during non-active periods is typically less than 80 mm Hg, but it can fluctuate between 80 and 89 mm Hg, which is considered stage 1 high blood pressure.
These numbers may increase during active or stressful periods, but there is no definitive range of fluctuation that applies to everyone.
Talk with a doctor if you find your blood pressure fluctuating between higher or lower readings.