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Dr. Andrew Rynne
MD
Dr. Andrew Rynne

Family Physician

Exp 50 years

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What Causes Dizziness And Blackout After Standing?

Hi, 2 questions: 1) is it normal for light headedness after standing-up to include almost a blackout and body-jerking? 2) what causes one have a ... cold spell, feeling very cold for a period of time? I just experienced that, and had to put on an extra sweater and scarf to heat-up again. No problems with weight, eating or exercising, trying to maintain a healthy life style Thanks
posted on Fri, 7 Oct 2016
Twitter Wed, 9 Nov 2016 Answered on
Twitter Wed, 9 Nov 2016 Last reviewed on
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Yes. it is normal to hve lighheadedness when you suddenly stand up from a sitting or lying position. this is called orthostatic hypotension. this is a brief adjustemt of the body when there is sudden change in position usually caused by delayed constriction of the lower body blood vessels, which is normally required to maintain an adequate blood pressure when changing position to standing. As a result, blood pools in the blood vessels of the legs for a longer period, and less is returned to the heart, thereby leading to a reduced cardiac output, thus causing lighheadedness and dizziness. Mild orthostatic hypotension is common and can occur briefly in anyone, although it is prevalent in particular among the elderly, and those with known low blood pressure. Severe drops in blood pressure can lead to fainting with a possibility of injury.
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What Causes Dizziness And Blackout After Standing?

Yes. it is normal to hve lighheadedness when you suddenly stand up from a sitting or lying position. this is called orthostatic hypotension. this is a brief adjustemt of the body when there is sudden change in position usually caused by delayed constriction of the lower body blood vessels, which is normally required to maintain an adequate blood pressure when changing position to standing. As a result, blood pools in the blood vessels of the legs for a longer period, and less is returned to the heart, thereby leading to a reduced cardiac output, thus causing lighheadedness and dizziness. Mild orthostatic hypotension is common and can occur briefly in anyone, although it is prevalent in particular among the elderly, and those with known low blood pressure. Severe drops in blood pressure can lead to fainting with a possibility of injury.