Why Do We Feel Dizzy When We Stand Up Fast? Initial Orthostatic Hypotension

Oct 16, 2026 · 4 min read · Sourced and fact-checked

The short answer: A brief drop in blood pressure right after standing can cause dizziness and blurred vision. A 2011 review says it bottoms out about 8 to 15 seconds after standing and passes within a minute.

Standing up quickly and seeing spots or feeling lightheaded is a common experience. A 2011 review in The Journal of Pediatrics by Stewart and Clarke describes the process, called initial orthostatic hypotension.

What happens

The review says the most frequent orthostatic complaint in young people is lightheadedness or dizziness on rapid standing. Typical signs are brief paleness, blurred or lost vision, some loss of muscle tone, and less often fainting. Symptoms vanish when the person lies down, and they are reduced or even prevented by standing up more slowly or in stages.

The cause is a short, large drop in blood pressure. According to the review, it bottoms out about 8 to 15 seconds after standing, while heart rate rises as pressure falls. If the person stays upright, symptoms fade within 60 seconds, usually in under 30.

Why standing is a challenge

The review explains that while lying down, the blood vessels and the veins are at the same height, so gravity does not pull blood in a particular direction. Standing requires quick adjustments by the circulation and nervous system to keep blood pressure and consciousness. If these are ineffective, or blood volume is low, the brain sits above the heart and large veins sit below it, so the heart fills less, blood pressure drops quickly, and blood flow to the brain falls.

Who gets it

The review says the most common sufferer is an adolescent in a growth spurt, often tall or growing fast, and similar complaints occur in slender young people with reduced blood volume. It estimates about 50 percent of adolescents, and somewhat fewer people in their twenties, experience this. In the elderly it becomes common and more dangerous, especially with medicines that affect blood vessels. Dehydration also makes it more likely.

How it differs from true orthostatic hypotension

The authors say initial orthostatic hypotension is short-lived and blood pressure always recovers, and it is associated with a working autonomic nervous system, usually with few consequences. True orthostatic hypotension is defined as a sustained fall in systolic pressure of at least 20 mm Hg or diastolic pressure of at least 10 mm Hg within 3 minutes of standing, and can reflect serious autonomic dysfunction. The review says extreme drops are rare, about 1 in 100 young patients seen at the authors' syncope center, but can lead to blackouts and need medical attention.

A note

If you faint, or dizziness lasts after you stand, see a doctor. This is general information, not medical advice.

Sources

"He's Dizzy when he Stands Up." An Introduction to Initial Orthostatic Hypotension, Stewart and Clarke, The Journal of Pediatrics, March 2011: https://pmc.ncbi.nlm.nih.gov/articles/PMC3029466/

Facts checked: October 16, 2026.