How much is the normal value of hypotension?

Normal systolic blood pressure is between 90 and 139mmHg, and normal diastolic blood pressure is between 60 and 89mmHg. Hypotension refers to systolic blood pressure less than 90mmHg and diastolic blood pressure less than 60mmHg. It may be caused by malnutrition and overwork. Patients may experience dizziness, fatigue, blurred vision and general fatigue.