A higher blood pressure while sitting than while lying down may be due to upright hypertension or measurement error.
The diagnostic criteria for hypertension are systolic blood pressure ≥140 mmHg and/or diastolic blood pressure ≥90 mmHg on three occasions not on the same day. upright hypertension is associated with persistent constriction of the small arteries or is an early stage of essential hypertension.
In addition, measurement errors are likely to occur if blood pressure is measured in an inappropriate manner in the seated position, if muscles are exerted during measurement, or if the rubber tubing of the sphygmomanometer is compressed. When measuring blood pressure, attention should be paid to measuring after a quiet rest, relaxing the muscles during measurement, with the sphygmomanometer and the measuring arm located at the same level, and it is best to measure three times to take the average value.
When the difference in blood pressure is obvious, it is necessary to actively consult a doctor and follow the doctor’s instructions for reasonable treatment.