Dizziness Orthostatic Hypotension

Overview

Orthostatic hypotension is a drop in blood pressure that happens when you stand up. 'Orthostatic' means related to standing upright, and 'hypotension' means low blood pressure. Normally, when you stand, your body quickly tightens your blood vessels and speeds your heart a little to keep blood flowing to your brain. If that adjustment is slow or weak, blood briefly pools in your legs, your blood pressure falls, and you feel dizzy, lightheaded, or wobbly for a few seconds or minutes. It is not a disease in itself — it is a sign that something is affecting your blood pressure, such as dehydration, a medicine, or another health condition.

Yes, it is common, especially in older adults. One reason is that blood pressure control becomes a little less quick with age. Another is that many people take medicines that lower blood pressure. It is also fairly common during pregnancy, after a long illness with bed rest, and in hot weather or when someone is dehydrated.

It can affect anyone, but it is seen most often in adults over 65, people taking medicines for high blood pressure or heart conditions, people with diabetes or Parkinson's disease, anyone who has been on bed rest, pregnant women, and people who are dehydrated through illness, heat, or not drinking enough. Children and teenagers can get it too, usually when they are unwell, dehydrated, or growing quickly, but it is less common in this age group.

Symptoms

Common symptoms

• Feeling dizzy, lightheaded, or 'floaty' just after standing up
• Blurred or greying vision for a few seconds
• Feeling faint or like you might black out
• Weakness or heaviness in the legs
• A spinning or swimming feeling in the head
• Feeling suddenly tired or drained on standing
• Awareness of your heartbeat, or a fluttering feeling
• Feeling sick or clammy
• Trouble concentrating or a moment of confusion
• Actually fainting, which is less common but can happen

Symptoms in children

• Feeling dizzy or wobbly when standing up quickly, especially after sitting on the floor or after a bath
• Going pale, sweaty, or complaining of a 'spinning' head
• Feeling tired or vague after standing for a long time in a queue or assembly
• Fainting briefly, often after being unwell, not eating, or being in a hot room
• Young teenagers going through a rapid growth spurt sometimes feel lightheaded when standing

Symptoms in older adults

• Dizziness on getting out of bed or out of a chair, which can lead to falls
• A general feeling of unsteadiness rather than clear dizziness
• Confusion or feeling 'not quite with it', which can be the main sign rather than dizziness
• Feeling unusually tired or weak after standing
• Symptoms that appear or worsen after a change in medicines
• Falls or near-falls, especially at night or after eating
• Symptoms that are easy to miss if someone is less able to describe them

Causes

Main causes

• Standing up quickly — the most common trigger
• Dehydration or low blood volume from not drinking enough, hot weather, vomiting, diarrhoea, or bleeding
• Medicines that lower blood pressure, water tablets, some heart medicines, some antidepressants, and some medicines used for prostate problems
• Age-related changes that make blood pressure adjust more slowly
• Nervous system conditions that affect blood pressure control, such as Parkinson's disease or nerve damage from diabetes
• Heart problems such as a slow or irregular heartbeat, or narrowed heart valves
• Long bed rest or being unwell and out of condition
• Pregnancy, especially in the first half
• Anaemia (a low red blood cell count) or low blood sugar
• Problems with the adrenal glands, which help control salt and blood pressure
• Alcohol, large or heavy meals, hot baths, saunas, and long periods of standing
• Sometimes no clear cause is found, and this is called age-related or unexplained orthostatic hypotension

Risk factors

• Being over 65
• Taking one or more medicines that lower blood pressure
• Diabetes
• Parkinson's disease or other nervous system conditions
• Being dehydrated or unwell with vomiting or diarrhoea
• Pregnancy
• Long periods of bed rest
• Drinking a lot of alcohol
• Very hot weather, hot baths, or saunas
• Eating large, heavy meals, especially meals high in starchy carbohydrates
• Standing still for a long time, such as in a queue or on public transport
• Anaemia or low blood sugar
• A family history of blood pressure problems

When to see a doctor

See a doctor urgently if:

• You faint, even if you feel fine afterwards
• You have chest pain, breathlessness, or a racing heartbeat with the dizziness
• You have signs of a stroke — face drooping, arm weakness, or slurred speech — call emergency services first
• You have black or bloody stools, or you are vomiting blood
• You feel dizzy with a fever and cannot keep fluids down
• Symptoms began or got worse after a new medicine or a dose change
• You have new weakness, numbness, or difficulty walking

Book a routine appointment if:

• You keep feeling lightheaded when standing up, even if it passes quickly
• The dizziness is affecting your confidence or stopping you going out
• You have had a near-fall or a fall
• You have diabetes, Parkinson's disease, or a heart condition and notice these symptoms
• You are pregnant and feeling faint on standing
• You want your medicines reviewed because you suspect they are causing the problem
• The problem is becoming more frequent or lasting longer

Diagnosis

A doctor can usually get a good idea from talking to you about when the dizziness happens and what you were doing. Then they will check your blood pressure while you are lying down and again after you stand up. This is a simple, painless test that can be done in the GP surgery or at home. They will also review all your medicines and ask about other symptoms. Sometimes blood tests or a heart tracing are arranged to look for an underlying cause.

Tests that may be done

• Blood pressure measured after lying down for about five minutes, then again after standing for one and three minutes
• A medicines review, including anything bought over the counter and any supplements
• A physical examination, including listening to your heart and checking for swelling in the legs
• Blood tests to check for anaemia, blood sugar, kidney and thyroid function, and salt levels
• An ECG (a painless heart tracing) to check your heart rhythm
• A heart monitor worn at home for a day or longer if an irregular rhythm is suspected
• An echocardiogram (an ultrasound scan of the heart) if a heart problem is suspected
• A tilt table test in a specialist clinic, where you lie on a bed that tilts you upright while your blood pressure is monitored
• A urine test or pregnancy test where relevant

What to expect at your appointment

Most people are diagnosed at a routine appointment without needing hospital tests. Your doctor will ask you to describe what happens, when it happens, and how long it lasts. The lying-and-standing blood pressure check takes a few minutes. Some results, like the blood pressure reading, are available straight away; blood tests usually come back within a few days. If a heart rhythm problem is suspected, you may be referred to a heart specialist, and there may be a short wait for that appointment. Bring a list of all your medicines, including anything you buy without a prescription, as this helps a lot.

Treatment

Treatment usually starts with simple everyday changes, because these work well for most people. Your doctor will look for and treat any underlying cause, such as dehydration, anaemia, or a medicine that is lowering your blood pressure too much. The aim is to keep your blood pressure steady enough that you feel well and stay safe from falls.

Self-care at home

• Stand up in stages — sit on the edge of the bed for a minute, then stand and hold on to something before walking
• Before getting up, pump your ankles and circle your feet a few times to get blood moving
• Drink enough fluid through the day — more in hot weather, when exercising, or when unwell
• Eat regular meals and avoid very large, heavy ones, which can make dizziness worse after eating
• Limit alcohol, which can lower blood pressure and cause dehydration
• Avoid very hot baths, showers, and saunas, and do not stand up suddenly afterwards
• If you feel symptoms starting, sit or lie down straight away, or cross your legs and squeeze your thighs and bottom muscles, which helps push blood back up
• Avoid standing still for long periods — shift weight, flex your feet, or walk in place
• Keep the head of your bed slightly raised if your doctor suggests it
• Use night lights and keep a clear path to the bathroom, since night-time trips are a common time to fall
• Have a glass of water by the bed if your doctor advises drinking before getting up
• Wear loose, comfortable clothing and avoid standing quickly after a hot drink

Medical treatments

Your doctor will first review your medicines and may change, reduce, or stop one that is dropping your blood pressure — never stop a medicine yourself without discussing it first. They will also treat any underlying cause, such as anaemia, an infection, dehydration, or a heart rhythm problem. Some people are prescribed medicines that help raise blood pressure or help the body hold on to salt and fluid; these are started at a low level and adjusted by your doctor, and they are used alongside, not instead of, the lifestyle measures. Compression stockings that squeeze the legs can help some people. If a heart or nervous system condition is behind the problem, your GP may refer you to a specialist clinic for more tailored care.

When is surgery considered?

Surgery is not a treatment for orthostatic hypotension itself. Occasionally, if dizziness is caused by a specific heart problem — such as a badly narrowed valve or an irregular heart rhythm that does not respond to other treatment — a procedure or pacemaker may be needed. This is decided by a heart specialist after tests. Most people with orthostatic hypotension never need any kind of procedure.

Living with this condition

Most people find that with a few adjustments, orthostatic hypotension fits into normal life without much trouble. The key habits are getting up slowly, keeping well hydrated, and knowing what to do the moment you feel lightheaded. It helps to plan around triggers: taking a moment before standing from a low sofa, holding a rail on the stairs, and choosing a seat on the bus. Tell the people you live with or work with what to do if you feel faint, and keep your phone with you when you are out.

Lifestyle tips

• Build the habit of standing up in two steps rather than one quick movement
• Carry a water bottle and sip through the day
• Eat smaller, more frequent meals rather than one large meal
• Keep alcohol to a minimum or avoid it, especially in the evening
• Wear shoes with good grip and keep floors clear at home to reduce fall risk
• Use a shower stool if hot showers make you dizzy
• Rise slowly after sitting in a hot bath or sauna, and keep the water temperature moderate
• Consider a bedside commode if night-time trips are risky, if your doctor agrees
• Have your blood pressure checked at your routine appointments
• Keep a simple note of when symptoms happen — it helps your doctor spot patterns

Diet and exercise

Regular fluid intake is the single most useful daily habit — aim for pale yellow urine as a rough guide. Eat regular meals with a mix of vegetables, whole grains, protein, and fruit, and avoid going long stretches without food. Salty food can help some people, but only increase salt if your doctor has said it is safe for you, because too much salt is harmful for some heart and kidney conditions. Gentle regular movement — walking, swimming, or seated exercise — helps your circulation and your overall fitness. Leg and ankle exercises, such as foot pumps and calf raises, are especially useful. Avoid sudden bursts of very strenuous exercise, particularly in the heat, and cool down slowly afterwards. A physiotherapist or an exercise specialist can help you build a safe routine.

Mental health and emotional wellbeing

Feeling dizzy or faint can be unnerving, and it is completely understandable if it makes you feel anxious about going out, standing in queues, or being alone. Some people start avoiding places and gradually become less active, which can lower mood. Naming that worry is a good first step. Talking to your doctor, a counsellor, or a supportive friend can help, and simple breathing exercises can steady you when anxiety rises. If low mood or anxiety is affecting your daily life, please tell your doctor — support is available. If you ever feel you cannot cope or have thoughts of harming yourself, contact your local emergency number or a crisis helpline in your country straight away.

Prevention

It cannot always be prevented, but a lot can be done to reduce how often it happens. Staying well hydrated, getting up slowly, avoiding long hot baths and too much alcohol, and having your medicines reviewed regularly all make a real difference. If you have a condition that affects blood pressure control, such as diabetes or Parkinson's disease, keeping it well managed helps too.

Screening programmes

There is no national screening programme for orthostatic hypotension. However, blood pressure is checked routinely at many appointments, and it is reasonable to ask for a lying-and-standing reading if you have been feeling lightheaded on standing or have had a fall. If you take medicines that lower blood pressure, your doctor will usually check your blood pressure and review your dose from time to time.

Complications

If left untreated

• Falls, which can cause bruises, broken bones, or head injuries — the main concern, especially in older adults
• Fainting in an unsafe place, such as on stairs or on the road
• Loss of confidence, leading to staying at home more and becoming less fit
• Injuries from fainting while driving or operating machinery
• In some people, reduced blood flow to the brain over time, which can affect memory and thinking
• Symptoms that point to a more serious underlying condition being missed if not checked
• Low mood and anxiety about going out

Long-term outlook

The outlook is good for most people. For many, simple changes — drinking more, standing up slowly, and reviewing medicines — are enough to make symptoms rare or mild. When there is an underlying cause such as dehydration, anaemia, or a medicine, treating that often solves the problem completely. For people with a long-term condition affecting blood pressure control, symptoms can usually be kept manageable with a combination of self-care and medical support. The important thing is to get checked so any cause can be found and your risk of falls kept low.

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