Fainting by Orthostatic Hypotension,
Fainting induced by orthostatic hypotension is another form of reflex syncope. Orthostatic hypotension also known as postural hypotension is a form of hypotension caused by the gravity of the blood in changing position, usually from lying down or siting position to standing up position. The gravity tends to pool the blood to the lower parts of the body. Because it is tightly controlled by the nerve system, however, people generally maintain normal blood pressure when changing position. Orthostatic hypotension occurs more in the elderly, or the people who have chronic diseases, or who take medicines that depress blood pressure.