Postural Hypotension
A drop in blood pressure when you stand up
Quick Facts
- Type: Cardiovascular / blood pressure condition
- Trigger: Standing up from sitting or lying down
- Common in: Older adults and people on blood pressure medicines
- Main risk: Falls and injury from fainting
Overview
Postural hypotension, also called orthostatic hypotension, is a form of low blood pressure that occurs when a person stands up after sitting or lying down. Normally, the body quickly tightens blood vessels and adjusts the heart rate to keep blood flowing to the brain against gravity. In postural hypotension, this adjustment is too slow or too weak, so blood pressure briefly falls and less blood reaches the brain.
This causes symptoms such as dizziness, lightheadedness, or feeling faint for a few seconds after standing. It is especially common in older adults and in people taking certain medications. While often mild, it can lead to falls and injuries, so identifying and managing the cause is important.
Symptoms
Symptoms appear within seconds to a few minutes of standing and usually ease once seated or lying down again.
- Lightheadedness or dizziness on standing
- Blurred vision or spots in front of the eyes
- Feeling faint or actually fainting
- Weakness or unsteadiness
- Confusion, particularly in older adults
- Sometimes nausea or a brief headache
Repeated fainting, falls, or symptoms that occur even when not changing position warrant prompt evaluation.
Causes
Many factors can interfere with the body's ability to maintain blood pressure on standing.
- Dehydration and low blood volume: From not drinking enough, fever, vomiting, diarrhea, or blood loss.
- Medications: Blood pressure drugs, diuretics, some antidepressants, and medicines for an enlarged prostate.
- Heart problems: A very slow or weak heart that cannot speed up enough on standing.
- Nervous system disorders: Conditions such as Parkinson disease and diabetes-related nerve damage that affect blood pressure control.
- Other factors: Prolonged bed rest, alcohol, hot weather, and large meals.
Risk Factors
- Older age
- Taking blood pressure or diuretic medications
- Diabetes and nerve-related conditions
- Parkinson disease and certain neurological disorders
- Dehydration or recent illness with fluid loss
- Prolonged bed rest or inactivity
- Heavy alcohol use
Diagnosis
Diagnosis usually involves measuring blood pressure in different positions.
- Orthostatic blood pressure check: Blood pressure and heart rate are measured lying down and again after standing to see how much the pressure drops.
- Medical history and medication review: To identify drugs or conditions contributing to the problem.
- Blood tests: To look for anemia, dehydration, blood sugar problems, or other causes.
- Heart tests: An ECG or other tests if a heart rhythm or structural problem is suspected.
- Tilt-table testing: Occasionally used for unexplained fainting.
Treatment
Treatment starts with simple measures and addresses the underlying cause.
- Lifestyle steps: Standing up slowly, staying well hydrated, and increasing salt if a clinician advises.
- Reviewing medications: Adjusting or changing drugs that lower blood pressure when possible.
- Physical measures: Compression stockings and crossing the legs or tensing muscles before standing.
- Medications: In persistent cases, drugs that raise blood volume or constrict blood vessels may be prescribed.
- Treating the cause: Managing diabetes, heart disease, or neurological conditions that contribute.
Prevention
- Stand up slowly, pausing at the edge of the bed or chair
- Drink enough fluids, especially in hot weather or illness
- Avoid prolonged standing still and very hot baths
- Limit alcohol
- Raise the head of the bed slightly if advised
- Review medications regularly with your clinician
When to See a Doctor
See a clinician if you regularly feel dizzy or faint on standing, especially if it affects your daily activities or you take blood pressure medication. Seek urgent care if you:
- Faint or fall and injure yourself
- Have repeated fainting episodes
- Experience chest pain, severe breathlessness, or palpitations
- Notice black stools or other signs of blood loss alongside the dizziness
Frequently Asked Questions
What is postural hypotension?
Postural hypotension, also called orthostatic hypotension, is a drop in blood pressure that happens when you stand up from sitting or lying down. It briefly reduces blood flow to the brain, causing dizziness or faintness for a few seconds.
Why do I feel dizzy when I stand up quickly?
When you stand, gravity pulls blood downward, and the body must quickly tighten blood vessels and adjust heart rate to keep blood reaching the brain. If this response is slow, blood pressure dips and you feel lightheaded. Standing up more slowly usually helps.
What causes postural hypotension?
Common causes include dehydration, blood pressure and diuretic medications, heart problems, and nervous system disorders such as Parkinson disease or diabetes-related nerve damage. Prolonged bed rest, alcohol, and hot weather can also contribute.
How can I prevent dizziness on standing?
Stand up slowly, stay well hydrated, avoid prolonged standing and very hot baths, limit alcohol, and review your medications with your clinician. Compression stockings and tensing the leg muscles before standing can also help.
When is postural hypotension serious?
See a doctor if it is frequent or affects daily life, and seek urgent care if you faint and injure yourself, have repeated fainting, or have chest pain, palpitations, or signs of blood loss such as black stools. These can point to a heart problem or significant cause.
References
- Mayo Clinic. Orthostatic hypotension (postural hypotension).
- MedlinePlus, U.S. National Library of Medicine. Orthostatic hypotension.
- National Institute on Aging (NIA). Falls and fall prevention.
- National Heart, Lung, and Blood Institute (NHLBI). Low blood pressure.