The blood pressure monitoring of smart watches is inaccurate, and there is a certain error value, which can only be used as a reference value.
Most smart watches use reflected light to monitor the arterial pulsation of the wrist, thus measuring blood pressure. However, the content perceived by smart watches is relatively limited, and it is impossible to measure the correct blood pressure safely and accurately. You really need to know your blood pressure value, measure it with the help of professional medical staff, or master the correct method of measuring blood pressure under the guidance of professional medical staff.