According to the Chinese guidelines for the treatment of hypertension, a systolic blood pressure of ≥140mmHg and a diastolic blood pressure of ≥90mmHg without the use of antihypertensive drugs is considered high blood pressure. A systolic blood pressure of 130-139mmHg and a diastolic blood pressure of 85-89mmHg, as long as one of the two reaches this level, is "normal high blood pressure".

But it should be noted that normal blood pressure fluctuates throughout the day, and is lowest when people are asleep and stable when they are sitting still. Nervousness, smoking, talking and drinking coffee can raise blood pressure, while blood pressure drops after meals, exercise and quiet reading.

To measure blood pressure accurately, you should not take medication or eat one hour before taking your blood pressure, and you should not smoke, drink coffee or tea for 30 minutes before taking your blood pressure, and you should urinate beforehand to avoid holding back your urine, as a full bladder will raise your blood pressure. Before measuring blood pressure, it is advisable to sit quietly in a room with moderate temperature for 5 minutes, in a quiet state, at the same time, measure the same upper extremity.

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