The ideal blood pressure for a normal person is a range where the systolic blood pressure is not less than 90mmHg and not more than 140mmHg. The diastolic blood pressure is not less than 60mmHg and not more than 90mmHg are considered normal. High pressure of 101mmHg and low pressure of 64mmHg are within the normal blood pressure range. Hypotension is diagnosed when the systolic blood pressure is below 90mmHg or diastolic blood pressure is below 60mmHg. Patients with hypotension are prone to symptoms of inadequate perfusion, dizziness, weakness and even syncope, and patients with anemia may also experience a decrease in blood pressure. The diagnosis of hypertension is made when the systolic blood pressure is greater than 140 mmHg or the diastolic blood pressure is greater than 90 mmHg, and the diagnosis of hypertension is made only when the measurements are above 140/90 mmHg for three consecutive days. Hypertensive disorders are classified as Grade 1, Grade 2 and Grade 3, with Grade 3 being the most dangerous Grade 1.