Dizziness is one of those symptoms that can mean different things to different people. One person may use the word to describe feeling faint. Another may mean the room is spinning. Someone else may feel unsteady, foggy, off-balance, light-headed, weak, nauseous or as if they might collapse.
Because “dizziness” is such a broad word, the first step is not to panic, but to describe the sensation as clearly as possible. Is it spinning vertigo? Is it light-headedness when you stand up? Is it imbalance when walking? Is it a strange woozy feeling during anxiety or after poor sleep? The answer can point towards very different causes.
Most dizziness is not caused by anything life-threatening. Common causes include inner ear problems, dehydration, low blood pressure, viral infections, migraine, anxiety, low blood sugar, medication side effects, anaemia, alcohol, poor sleep and standing up too quickly.
However, dizziness can occasionally be a sign of something serious, including stroke, heart rhythm problems, severe infection, carbon monoxide poisoning, bleeding, very low blood pressure or a neurological condition. This guide explains the common causes, how vertigo differs from light-headedness, what red flags to watch for, and when to seek urgent medical help.
Important: this article is for general information only and should not replace medical advice. If your dizziness is sudden, severe, unusual, associated with weakness, speech problems, chest pain, fainting or a severe headache, seek urgent help.
When dizziness may be an emergency
Most dizzy spells are not emergencies, but some combinations of symptoms need urgent assessment. Dizziness can be caused by harmless inner ear problems, but it can also occur with stroke, heart problems, severe dehydration, infection or neurological conditions.
Call 999 or go to A&E now if dizziness comes with any of the following:
- weakness, numbness or tingling in the face, arm or leg, especially on one side
- facial drooping, slurred speech, confusion or difficulty speaking
- new trouble walking, loss of coordination or severe unsteadiness
- double vision, sudden vision loss or new severe visual disturbance
- a sudden, severe headache or a headache that feels unlike anything you have had before
- fainting, collapse or loss of consciousness
- chest pain, severe breathlessness, a very irregular heartbeat or symptoms of a heart attack
- a seizure
- sudden hearing loss with severe dizziness
- severe dizziness after a head injury
NHS guidance advises seeking help for dizziness or vertigo that does not go away, keeps coming back, or is associated with symptoms such as hearing changes, tinnitus, visual changes, numbness, weakness, fainting, headache, sickness or pulse changes. NHS dizziness guidance gives more detail on when to get help. NICE also notes that dizziness with focal neurological signs needs more urgent consideration, while dizziness without imbalance or other focal neurological deficit is less likely to indicate a serious neurological condition. NICE neurological referral guidance covers this in more detail.
If dizziness comes with a sudden severe headache, you may also find our guide to headache red flags and when to seek urgent help useful.
First: what do you mean by dizziness?
The word dizziness can describe several different sensations. Working out which one you mean can make the cause much clearer.
Vertigo: “the room is spinning”
Vertigo is a false sensation of movement. You may feel as if the room is spinning, tilting, swaying or moving, even when you are still. It may be triggered by turning over in bed, looking up, bending down or moving your head quickly.
Vertigo often points towards the balance system in the inner ear, although migraine and neurological causes can also produce vertigo. The NHS describes vertigo as a symptom rather than a condition in itself, often making you feel as if you or everything around you is spinning. You can read the official NHS overview here: NHS vertigo guidance.
Light-headedness: “I might faint”
Light-headedness feels more like you are about to pass out. It may happen when standing up quickly, after not eating, during dehydration, after blood loss, during anxiety, in hot environments, or because of low blood pressure or heart rhythm problems.
People often describe this as feeling faint, woozy, weak, shaky, pale or as if their vision is narrowing. It may improve when lying down.
Imbalance: “I feel unsteady on my feet”
Imbalance means difficulty walking steadily or feeling as if you might fall. It can be caused by inner ear problems, nerve problems in the feet, muscle weakness, medication side effects, alcohol, vision problems, stroke, Parkinson’s disease, low blood pressure or general frailty.
New severe imbalance, especially with speech problems, weakness, double vision or a sudden severe headache, needs urgent assessment.
Wooziness or brain fog
Some people use dizziness to describe a vague foggy or spaced-out feeling. This may happen with anxiety, poor sleep, viral illness, dehydration, low blood sugar, anaemia, medication side effects, long COVID, alcohol, stress or over-breathing during panic.
This kind of dizziness can still be very unpleasant, even when it is not dangerous. The key is to look at the whole pattern and associated symptoms.
Common causes of dizziness
1. Benign paroxysmal positional vertigo
Benign paroxysmal positional vertigo, often shortened to BPPV, is one of the most common causes of true spinning vertigo. It happens when tiny calcium crystals in the inner ear move into the wrong part of the balance system. This sends confusing movement signals to the brain.
BPPV often causes short bursts of vertigo lasting seconds to a minute. It is commonly triggered by turning over in bed, getting out of bed, looking up, bending down or moving the head into a particular position. Between attacks, you may feel mostly normal or mildly off-balance.
BPPV can feel dramatic, but it is usually not dangerous. Treatment often involves specific repositioning manoeuvres, such as the Epley manoeuvre, performed by a trained clinician or taught when appropriate. If you have new vertigo, especially if it is severe or associated with neurological symptoms, you should be assessed before assuming it is BPPV.
2. Vestibular neuritis
Vestibular neuritis is inflammation of the vestibular nerve, which helps carry balance signals from the inner ear to the brain. It is often linked to a viral infection.
It can cause sudden, intense vertigo that lasts for hours or days, often with nausea, vomiting and difficulty walking. Hearing is usually not affected. People may feel extremely unwell at first, then gradually improve over days to weeks.
Because vestibular neuritis can mimic more serious causes of acute dizziness, particularly in older adults or people with stroke risk factors, sudden severe vertigo should be assessed carefully.
3. Labyrinthitis
Labyrinthitis is inflammation of the inner ear balance and hearing structures. It can cause vertigo, nausea, vomiting, hearing loss, ringing in the ear or a feeling of pressure in the ear.
It may follow a viral infection, although bacterial infection is possible less commonly. If dizziness is associated with new hearing loss, ear pain, discharge, fever or severe symptoms, medical advice is important.
If hearing symptoms are part of the picture, our guides to hearing loss and tinnitus may help you understand related symptoms.
4. Ménière’s disease
Ménière’s disease is a long-term inner ear condition that can cause episodes of vertigo, fluctuating hearing loss, tinnitus and a feeling of fullness or pressure in the ear. Attacks can last from minutes to hours and may be followed by tiredness or imbalance.
Not everyone with vertigo and tinnitus has Ménière’s disease. Other inner ear conditions, migraine, wax, infections and hearing problems can overlap. Recurrent vertigo with hearing symptoms should be assessed by a GP, audiology service or ENT specialist depending on the situation.
5. Migraine-related dizziness
Migraine does not always mean headache. Some people get vestibular migraine, where dizziness, vertigo, motion sensitivity or imbalance are major symptoms. Headache may be present, but it may be mild or absent.
Migraine-related dizziness can be triggered by poor sleep, stress, certain foods, alcohol, dehydration, hormones, bright lights, screen use or busy visual environments such as supermarkets. People may also have nausea, light sensitivity, sound sensitivity, visual aura, pressure in the head or a history of migraine.
If your dizziness is linked with headache, visual symptoms or sensitivity to light and sound, read our guide to headache causes and red flags.
6. Low blood pressure
Low blood pressure, or hypotension, can cause dizziness, light-headedness, blurred vision, weakness, nausea, confusion or fainting. This is especially common when standing up from sitting or lying down, known as postural or orthostatic hypotension.
The NHS lists light-headedness or dizziness, feeling sick, blurred vision, weakness, confusion and fainting as possible symptoms of low blood pressure. It also notes that symptoms when standing or changing position may suggest postural hypotension. NHS low blood pressure guidance explains this further.
Low blood pressure may be related to dehydration, heat, pregnancy, blood loss, heart problems, endocrine conditions, prolonged bed rest, alcohol, or medicines such as blood pressure tablets, diuretics, antidepressants or medicines for prostate symptoms.
If you monitor your blood pressure at home, technique matters. See our guide to home blood pressure monitoring.
7. Dehydration and heat
Dehydration is a very common cause of dizziness. It may happen after vomiting, diarrhoea, fever, sweating, exercise, alcohol, hot weather or simply not drinking enough. Dizziness from dehydration is often worse when standing and may come with thirst, dry mouth, dark urine, headache, tiredness or muscle cramps.
In hot weather, dizziness can also be a sign of heat exhaustion. If someone is dizzy, very thirsty, weak, sweating heavily, nauseous, cramping or has a headache after heat exposure, they should be moved somewhere cool and given fluids if safe. Confusion, collapse, very high temperature or reduced consciousness can suggest heatstroke and is an emergency.
You can read more in our guides to dehydration symptoms in adults and children and heat exhaustion and heatstroke.
8. Low blood sugar
Low blood sugar can cause dizziness, shakiness, sweating, hunger, anxiety, palpitations, weakness, blurred vision, confusion or fainting. It is more common in people with diabetes who use insulin or certain diabetes medicines, but anyone can feel light-headed after long periods without food, intense exercise or alcohol on an empty stomach.
If you have diabetes and dizziness may be due to low blood sugar, follow your diabetes care plan. If someone is confused, drowsy, having a seizure or unable to swallow safely, seek emergency help.
If you are trying to understand blood sugar results, see our guide to HbA1c and blood sugar results.
9. Anaemia and iron deficiency
Anaemia means the blood has reduced ability to carry oxygen. It can cause dizziness, fatigue, shortness of breath, palpitations, headaches, pale skin, weakness and reduced exercise tolerance.
Common causes include iron deficiency, heavy periods, pregnancy, low B12 or folate, chronic disease, kidney disease and blood loss from the gut. Dizziness from anaemia is often more of a light-headed, weak or breathless feeling than spinning vertigo.
Relevant guides include full blood count results, iron, ferritin and anaemia blood tests, and B12 and folate blood test results.
10. Heart rhythm problems
Dizziness can happen when the heart is beating too fast, too slowly or irregularly, reducing blood flow to the brain. People may notice palpitations, skipped beats, chest discomfort, breathlessness, fainting or near-fainting.
Occasional harmless palpitations are common, but dizziness with palpitations should be taken seriously, especially if there is chest pain, shortness of breath, fainting or known heart disease. Tests may include an ECG, blood tests, blood pressure checks or longer heart rhythm monitoring.
For more detail, see our guides to heart palpitations, ECG results explained and atrial fibrillation and stroke risk.
11. Anxiety, panic and over-breathing
Anxiety can cause dizziness through adrenaline, muscle tension, changes in breathing, poor sleep, reduced food intake and heightened body awareness. During panic, people may feel light-headed, unreal, shaky, breathless, hot, cold, numb around the mouth or hands, or as if they might faint.
This can be terrifying, and the symptoms are real. However, it is still important not to assume dizziness is anxiety if it is new, severe, associated with neurological symptoms, or linked with chest pain, fainting or an irregular heartbeat.
If anxiety symptoms are part of the picture, you may find our guide to mental health support options in the UK useful.
12. Medication side effects
Many medicines can cause dizziness, especially when starting, stopping or changing dose. Examples include blood pressure medicines, diuretics, antidepressants, sleeping tablets, anxiety medicines, strong painkillers, antihistamines, anti-sickness medicines and some prostate medicines.
Do not stop prescribed medicines suddenly without advice, particularly antidepressants, blood pressure medicines, epilepsy medicines or heart medicines. If dizziness began after a medication change, speak to a pharmacist, GP or prescriber.
13. Earwax, ear infections and Eustachian tube problems
Ear conditions can affect balance because the inner ear plays a major role in telling the brain where the head is in space. Earwax usually causes hearing blockage more than true vertigo, but ear infections, pressure changes, fluid behind the eardrum or Eustachian tube dysfunction can contribute to imbalance or dizziness.
Symptoms such as ear pain, discharge, fever, new hearing loss, tinnitus or pressure in the ear make an ear-related cause more likely.
14. Neck problems and cervicogenic dizziness
Some people feel dizzy or unsteady with neck pain, stiffness or after whiplash. The relationship between neck problems and dizziness can be complicated because neck pain, migraine, vestibular problems and anxiety can overlap.
Seek medical advice if dizziness follows trauma, is severe, is associated with neurological symptoms, or if neck pain comes with fever, severe headache, weakness, numbness or difficulty walking.
15. Carbon monoxide poisoning
Carbon monoxide poisoning can cause headache, dizziness, nausea, weakness, confusion, chest pain and flu-like symptoms without a fever. It is more likely if symptoms affect several people in the same property, improve when away from home, or occur near gas appliances, boilers, fires, stoves or generators.
If carbon monoxide poisoning is possible, leave the property, get fresh air and seek urgent help.
Dizziness and stroke: why it can be tricky
Most dizziness is not a stroke. However, stroke affecting the back part of the brain can sometimes present with dizziness, vertigo, imbalance, vomiting, visual symptoms or coordination problems. This can be difficult because inner ear vertigo can also be intense and cause vomiting.
Stroke is more concerning when dizziness is sudden and comes with other neurological symptoms, such as weakness, numbness, facial droop, slurred speech, double vision, severe unsteadiness, difficulty swallowing, severe headache or new hearing loss. People with risk factors such as atrial fibrillation, high blood pressure, diabetes, smoking or previous TIA/stroke should be especially cautious.
If you suspect stroke, call 999. Do not drive yourself to hospital.
Related guides: stroke symptoms and TIA, high blood pressure and high cholesterol.
What to do during a dizzy spell
If you suddenly feel dizzy, stop what you are doing and reduce the risk of falling. Sit or lie down if possible. Avoid driving, climbing ladders, operating machinery or standing near hazards until the dizziness has fully passed.
If the dizziness feels like faintness, lying down with your legs raised may help. Drink water if you can swallow safely and you are not on fluid restriction. If you have missed a meal, eating something may help. If you have diabetes, check your blood sugar if you are able to do so.
If the dizziness feels like spinning vertigo, try to keep your head still and focus on a fixed point. Avoid sudden movements. Nausea is common with vertigo, so small sips of fluid may be easier than large drinks.
Seek urgent help if symptoms are severe, new, prolonged, associated with red flags, or if you are at risk of falling and cannot stay safe.
How a clinician may assess dizziness
A good dizziness assessment starts with the story. The clinician will usually ask what you mean by dizziness, when it started, how long it lasts, what triggers it, whether it is spinning or faintness, and whether there are ear, heart, neurological, visual or infection symptoms.
They may check:
- blood pressure and pulse, sometimes lying and standing
- temperature and hydration
- heart rhythm
- ears and hearing
- eye movements
- balance and walking
- neurological signs such as strength, sensation, coordination and speech
- medication history
Depending on the pattern, tests may include blood tests, ECG, hearing tests, balance tests, urine tests, blood pressure monitoring, heart rhythm monitoring, CT scan or MRI scan. Not everyone needs tests; many causes can be identified from the history and examination.
For background reading, see our guides to blood test results, ECG results and scan results.
Treatment depends on the cause
There is no single treatment for dizziness because dizziness is a symptom, not a diagnosis. Treatment depends on whether the cause is inner ear, blood pressure, heart rhythm, migraine, dehydration, medication-related, neurological, anxiety-related or something else.
BPPV may improve with repositioning manoeuvres. Vestibular neuritis and labyrinthitis may need short-term symptom control, hydration and gradual movement rehabilitation. Low blood pressure may require reviewing medicines, improving fluid intake, standing up more slowly or treating an underlying cause. Migraine-related dizziness may improve with migraine management, trigger reduction and preventive treatment where needed.
Anti-sickness or dizziness medicines can sometimes help in the short term, but they are not always suitable for long-term use because they may slow the brain’s natural compensation after vestibular problems. A pharmacist or GP can advise what is appropriate.
Can dizziness be prevented?
Some dizziness cannot be prevented, especially sudden inner ear conditions. But many episodes can be reduced by addressing common triggers.
Helpful steps may include:
- drinking enough fluid, especially during hot weather or illness
- eating regular meals and avoiding long gaps without food
- standing up slowly, especially after lying down
- reviewing medicines if dizziness began after a change
- limiting alcohol
- improving sleep
- managing migraine triggers without becoming overly restrictive
- checking blood pressure if symptoms suggest faintness
- having hearing, vision or balance symptoms assessed
- reducing fall risks at home if dizziness keeps recurring
If dizziness is recurrent, keeping a symptom diary can help. Record when it happens, how long it lasts, whether it feels like spinning or faintness, triggers, pulse, blood pressure if available, food and fluid intake, medicines, headaches, hearing symptoms and any neurological symptoms.
When to see a GP about dizziness
Arrange a GP appointment if dizziness keeps coming back, does not settle, affects daily life, causes falls, is linked with hearing changes or tinnitus, or is associated with headaches, palpitations, fainting, visual changes or medication changes.
You should also seek advice if you are older, pregnant, have diabetes, have known heart disease, have a history of stroke or TIA, are on blood thinners, or feel unsafe walking because of dizziness.
The bottom line
Dizziness is common, and most causes are not dangerous. Inner ear problems, dehydration, low blood pressure, migraine, anxiety, medication side effects and viral illnesses are frequent explanations.
The important thing is to identify the pattern. Spinning vertigo triggered by head movement is different from feeling faint when standing. Dizziness with hearing symptoms is different from dizziness with palpitations. Dizziness with weakness, slurred speech, double vision, severe headache, chest pain, fainting or severe unsteadiness needs urgent medical help.
If you are unsure, it is better to ask for advice than to ignore a new or worrying symptom.
FAQ: dizziness, vertigo and low blood pressure
What is the difference between dizziness and vertigo?
Dizziness is a broad word that can mean light-headedness, faintness, imbalance, wooziness or spinning. Vertigo specifically means a false sensation of movement, often described as the room spinning or tilting.
What is the most common cause of vertigo?
One of the most common causes is benign paroxysmal positional vertigo, or BPPV. It causes short bursts of spinning vertigo triggered by certain head movements, such as turning over in bed or looking up.
Can low blood pressure make you dizzy?
Yes. Low blood pressure can cause light-headedness, dizziness, weakness, blurred vision, nausea, confusion or fainting. It is often worse when standing up quickly or after dehydration, heat, alcohol or medication changes.
When should I worry about dizziness?
Worrying signs include dizziness with weakness, numbness, facial drooping, slurred speech, double vision, chest pain, fainting, severe headache, sudden hearing loss, severe unsteadiness, seizure or symptoms after a head injury. These need urgent medical assessment.
Can anxiety cause dizziness?
Yes. Anxiety and panic can cause dizziness through changes in breathing, adrenaline, muscle tension, poor sleep and heightened body awareness. However, new or severe dizziness should not automatically be assumed to be anxiety, especially if there are red flag symptoms.
Why do I feel dizzy when I stand up?
This may be postural or orthostatic hypotension, where blood pressure drops when you stand. It can be related to dehydration, medicines, prolonged bed rest, ageing, pregnancy, heart problems or nervous system conditions. If it keeps happening, seek medical advice.
Can dehydration cause dizziness?
Yes. Dehydration is a common cause of dizziness and light-headedness. It may also cause thirst, dry mouth, dark urine, tiredness, headache and feeling worse when standing.
Can ear problems cause dizziness?
Yes. The inner ear contains the balance system, so conditions such as BPPV, vestibular neuritis, labyrinthitis and Ménière’s disease can cause vertigo or imbalance. Ear symptoms such as hearing loss, tinnitus, pressure or pain can give useful clues.
Can dizziness be a sign of stroke?
Sometimes. Most dizziness is not a stroke, but sudden dizziness with weakness, numbness, facial droop, slurred speech, double vision, severe unsteadiness or loss of coordination can be a stroke warning sign. Call 999 if stroke is possible.
Why do I feel dizzy and sick?
Nausea is common with vertigo because the balance system is closely connected to the vomiting centre in the brain. Feeling dizzy and sick can also happen with migraine, dehydration, low blood pressure, low blood sugar, infection, anxiety or medication side effects.
Should I drive if I feel dizzy?
No. Do not drive while dizzy or if you feel you may faint, lose balance or have delayed reactions. Wait until symptoms have fully settled and seek medical advice if dizziness is recurrent or unexplained.
What tests are done for dizziness?
Tests depend on the suspected cause. A clinician may check blood pressure, pulse, ears, eye movements, balance and neurological signs. Blood tests, ECG, hearing tests, heart rhythm monitoring or scans may be used when appropriate.
Can migraine cause dizziness without headache?
Yes. Vestibular migraine can cause vertigo, dizziness, motion sensitivity, nausea and imbalance with little or no headache. A history of migraine, light sensitivity, sound sensitivity or visual aura can be clues.
How long should vertigo last?
It depends on the cause. BPPV often causes brief attacks lasting seconds to a minute. Vestibular neuritis can cause severe vertigo lasting days. Ménière’s disease may cause attacks lasting minutes to hours. Vertigo that is sudden, severe, persistent or associated with red flags should be assessed.
What can I do at home for dizziness?
Sit or lie down, avoid sudden movements, drink water if safe, eat if you have missed a meal, and avoid driving or using machinery. Seek medical help if symptoms are severe, new, recurrent, prolonged or associated with warning signs.
