Quick summary
That head swim when you get out of a chair usually means your blood pressure is dropping as you stand. It is called postural hypotension, it becomes more common with age, and it is behind a surprising share of falls. Ask your GP for a lying and standing blood pressure check, by name.
What is happening
When you stand, gravity pulls blood down into your legs. Normally your body corrects for it within seconds by tightening blood vessels and raising your heart rate, and you notice nothing.
If that correction is slow or incomplete, blood pressure falls and the brain is briefly short of blood. That is the dizziness, the greying vision, the sense of the room moving.
The clinical name is postural hypotension, sometimes called orthostatic hypotension: a drop in blood pressure on standing from sitting or lying. It can cause dizziness, unsteadiness, blurred vision, weakness and occasionally a blackout, and it is strongly associated with falls (Leeds Teaching Hospitals NHS Trust).
Why it matters more than it feels like it should
Most people treat it as an annoyance. Two reasons it is worth taking seriously.
First, it causes falls at the worst possible moment: mid-transfer, often in the bathroom or beside the bed, where there is porcelain and tile rather than carpet. A fall while standing up from the toilet at 3am is a different proposition from a trip on a rug.
Second, it can happen with no symptoms at all. Some people’s blood pressure drops significantly without them feeling much, which is why unexplained falls should always prompt the measurement even when nobody reports dizziness.
The pattern that gives it away
- Worse first thing in the morning, getting out of bed.
- Worse 15 to 45 minutes after a meal, as blood diverts to the gut. Large or carbohydrate-heavy meals do it most.
- Worse in hot weather, after a hot bath, or when dehydrated.
- Worse after standing still for a while, such as in a queue.
- Worse after a new tablet or a dose change.
- Better when sitting back down, quickly.
Keep a short note of when it happens for a week before the GP appointment. The pattern is often more useful than the description.
What causes it
Usually more than one thing at once.
Cause | What it looks like |
|---|---|
Medication | The most common contributor. Blood pressure tablets, water tablets, some antidepressants, medicines for prostate symptoms and Parkinson’s medication all feature |
Dehydration | Not drinking enough, hot weather, a stomach upset, or water tablets |
Age itself | The reflex that corrects blood pressure becomes slower |
Long-term conditions | Diabetes and Parkinson’s both affect the nerves controlling blood pressure |
Bed rest or illness | A week in bed or in hospital deconditions the system quickly |
Large meals and alcohol | Both lower blood pressure for a period afterwards |
Heart problems | Less common, and the reason unexplained cases need proper assessment |
What to ask the GP for
Use the exact phrase: “a lying and standing blood pressure check”.
It takes a few minutes. Blood pressure is measured lying down after a rest, then again shortly after standing, usually at one and three minutes. A single seated reading will not show the problem, which is why this gets missed for months.
Ask for a medication review at the same appointment, since the two usually belong together. Take every box, including anything bought over the counter.
Do not stop or change any medicine yourself. Some of the drugs involved are treating serious conditions, and the right answer is a considered change rather than a gap.
What helps
Once a clinician has looked at the medicines, these are the practical measures usually suggested. Check them with your GP first, particularly the ones about fluid and salt, which are not right for everyone.
- Stand up in stages. Sit on the edge of the bed for a slow count of twenty before standing. This single habit prevents a lot of falls.
- Pump your ankles before standing, and clench your calf and buttock muscles as you rise.
- Drink enough. Dehydration makes it markedly worse.
- Smaller, more frequent meals, especially if it is worse after eating.
- Go carefully with hot baths and hot weather.
- Ask about compression stockings, which help some people and need fitting properly.
- Ask about raising the head of the bed slightly, which is sometimes advised.
- Light on the route to the bathroom, because the night-time trip is where this most often causes a fall.
When it is something else
Not all dizziness is blood pressure, and the distinction matters.
- Room spinning rather than lightheadedness, particularly when turning over in bed, suggests an inner ear cause such as BPPV, which is often very treatable.
- Palpitations or blackouts with no warning point at a heart rhythm cause. NICE recommends investigating unexplained falls for cardiac causes, including carotid sinus hypersensitivity (NICE NG249).
- Sudden severe symptoms, chest pain, breathlessness, weakness down one side or slurred speech need 999.
- Sudden confusion is a separate emergency. The NHS advice is to go to A and E or call 999.
If someone actually blacks out, say so in those words rather than describing a fall, because the two are investigated very differently. Our guide to getting an assessment covers what follows if mobility has become a longer-term problem.
Frequently asked questions
What causes a sudden drop in blood pressure when standing?
Most often medication, dehydration, or the age-related slowing of the reflex that corrects blood pressure, usually in combination. Diabetes, Parkinson’s and heart conditions can also contribute.
Is it dangerous?
The dizziness itself passes. The danger is falling during it, and it is strongly associated with falls in older people, which is why it is worth measuring and treating.
Should I stop my blood pressure tablets?
No. Take them to your GP or pharmacist and ask for a review. Stopping treatment for high blood pressure without advice carries its own serious risks.
Will drinking more water fix it?
It helps, and it is rarely the whole answer. Fluid advice also needs checking with a clinician for anyone with heart or kidney conditions.
Why is it worse after lunch?
Blood diverts to the digestive system after eating, lowering blood pressure for a period. Smaller meals often help.
Can it be cured?
It can often be substantially improved, particularly where medication is contributing. Many people manage it well with a medication change and the standing-up-slowly habit.
About Visiting Angels Cheshire East
Visiting Angels Cheshire East provides care at home across Macclesfield, Wilmslow, Knutsford, Congleton, Alsager and the surrounding villages of East Cheshire, along with Buxton, Whaley Bridge and the Staffordshire Moorlands towns. You can see all the areas we cover.
- Visits built around the risky times, which for this is usually first thing in the morning.
- No visit is ever shorter than an hour, so nobody is hurried out of bed.
- You see the same faces. Our carer turnover is 12 per cent, against a sector figure of 23.7 per cent (Skills for Care, 2025), and a familiar carer notices a pattern worth reporting to the GP.
- You choose your caregiver, and meet them before care starts.
- Carers trained in dementia, Parkinson’s, stroke recovery and complex care.
Alan’s wife is supported at home, and this is what he wrote:
“Excellent in every respect. Staff are caring, friendly and helpful. [Our carers] do everything they can to make my wife’s life easier. Management and staff are flexible in their approach and do the unpleasant jobs with a smile and willingness which is commendable. They are always willing to ‘go the extra mile.'”
Alan Hallett, Google review
Not sure what you need yet? Start with a free assessment
Our free home care assessment is a visit at a time that suits you, with no obligation afterwards. In it we will:
- Work out when the difficult moments are, which for dizziness is usually getting up and after meals.
- Talk through a realistic package, and what it would cost.
- Look at the money with you, and point you towards the funding, benefits and grants you may be entitled to.
- Tell you honestly if a GP appointment is what is needed, because for this it very often is.
If someone is unsteady getting up and you are worried about mornings, call us on 01625 720157. You can also send an enquiry, and you can see what our services cover.
Authored by Dr Haroon Ahmad, Managing Director, Visiting Angels Cheshire East.
Published 27 September 2026. Last updated 27 September 2026.
This article is general information, not medical advice, and no substitute for assessment by a GP or other clinician. Do not start, stop or change any medicine on the basis of it, and check fluid, salt and compression advice with a clinician, since it is not suitable for everyone. If someone blacks out, has chest pain, becomes suddenly confused, or has weakness or slurred speech, call 999. The author is a director of the company and is not acting in a clinical capacity, and Visiting Angels Cheshire East provides personal care at home rather than medical or nursing care. To the fullest extent permitted by law, GB Care at Home Ltd accepts no liability for any loss or injury arising from reliance on this article.
