In physiology and medicine, hypotension refers to an abnormally low blood pressure. It is often associated with shock, though not necessarily indicative of it.
Orthostatic hypotension is a common cause of low blood pressure, resulting from a sudden change in body position. Reduced blood volume, called hypovolemia, can also cause hypotension and often results from the use of diuretics or vasodilators such as nitric oxide or furosemide.
For most individuals, a healthy blood pressure lies between 90/60 mmHg to 130/80 mmHg. A small drop in blood pressure, even as little as 20 mmHg, can result in transient hypotension.
Low blood pressure is often accompanied by: