Normal blood pressure in adults is measured according to the resting state, mainly the brachial artery as the standard, normal blood pressure is less than 120 mmHg systolic and less than 80 mmHg diastolic, hypertension diagnostic criteria not non-same day three times blood pressure ≥ 140/(or) 90 mmHg. many factors can affect the level of blood pressure, such as age, blood pressure with age, systolic and diastolic blood pressure have increased, but The tendency to increase systolic blood pressure is more pronounced than that of diastolic blood pressure. Then there is gender. There is little difference between men and women during adolescence, and women’s blood pressure is lower than men’s before menopause and slightly higher after menopause. Day and night and sleep also affect blood pressure, which is lowest in the early morning and then rises gradually, reaching a maximum in the evening. If you don’t sleep well, your blood pressure will also increase slightly. Cold environments affect peripheral circulation, causing vasoconstriction and a rise in blood pressure. Blood pressure can decrease in a high temperature environment when the skin is vasodilated.