The normal blood pressure is less than 120 mmHg systolic and less than 80 mmHg diastolic. high pressure, high pressure, that is, non-systolic hypertension, the systolic and diastolic blood pressure are higher than normal. It is generally seen for the following reasons: 1. water and sodium retention, when consuming food with high salt content, sodium chloride causes the crystal osmotic pressure to rise, water reabsorption increases, high pressure and low pressure increase. 2. vascular stenosis, angiotensin and other hormones that cause vasoconstriction secretion, vascular stenosis, blood pressure increases. 3. after intense exercise, exercise makes sympathetic nerve excitation, vasoconstriction effect, also high pressure and low pressure will 4, secondary hypertension, some diseases, such as aldosteronism also often cause an increase in blood pressure.