systolic blood pressure less than or equal to 90 mm Hg for adults or less than fifth percentile by age for children aged less than16 years; orthostatic drop in diastolic blood pressure greater than or equal to 15 mm Hg from lying to sitting, orthostatic syncope, or orthostatic dizziness
Hypotension is a condition in which the arterial blood pressure is abnormally low It occurs after excessive fluid loss or following severe blood loss from any cause
Low blood pressure or a sudden drop in blood pressure A person rising quickly from a sitting or reclining position may have a sudden fall in blood pressure, causing dizziness or fainting
low blood pressure or a sudden drop in blood pressure Hypotension may occur when a person rises quickly from a sitting or reclining position, causing dizziness or fainting
or low blood pressure Condition in which blood pressure is abnormally low. It may result from reduced blood volume (e.g., from heavy bleeding or plasma loss after severe burns) or increased blood-vessel capacity (e.g., in syncope). Orthostatic hypotension drop in blood pressure on standing results from failure of the reflexes that contract muscles and constrict blood vessels in the legs to offset gravity as one rises. Hypotension is also a factor in poliomyelitis, shock, and barbiturate poisoning