A blood pressure of 130/80 mmHg is the normal range, hypertension can only be diagnosed if the systolic blood pressure, also known as high pressure, exceeds 140 mmHg, or if the diastolic blood pressure, also known as low pressure, exceeds 90 mmHg, but this result requires several measurements to be determined. Firstly, it is necessary to choose a different time period in 3 different days. Secondly, you have to take a rest for 30 minutes before measuring your blood pressure, and avoid emotional tension, excitement, anxiety, tea, alcohol and coffee for 30 minutes. If the measured results are all in 130/80mmHg, it belongs to the normal range. However, high blood pressure cannot be completely excluded because some patients may experience increased blood pressure during sleep at night.