Systolic blood pressure lower than 90 mmHg and diastolic blood pressure lower than 60 mmHg are considered hypotension.

Hypotension is divided into physiological hypotension and pathological hypotension. Physiological hypotension generally has no symptoms and does not require special treatment. Patients with pathological hypotension often experience symptoms such as dizziness, fainting, blurred vision, nausea, etc., and need to be treated according to the cause. Hypotension patients often have postural hypotension and postprandial hypotension. The normal blood pressure range for adult males and females of any age is systolic pressure between 90 to 139 mmHg and/or diastolic pressure between 60 to 89 mmHg.