In short, someone said to suffer hypertension or hypertension when the systolic blood pressure above 140 mmHg or diastolic pressure above 90 mmHg. Ideal blood pressure is 120 mmHg for systolic and 80 mmHg diastolic. In many cases, both the pressure increases.

Systolic blood pressure (top number) is the maximum pressure is reached when the heart contracts and blood in the arteries pump. While diastolic blood pressure (bottom number) was taken when the pressure falls to its lowest point when the blood fills the heart to relax and reconnect.

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