On this page
Dr. Chrysoula I. Liakou MD, PhD
When dizziness or fainting is urgent
Call 112 if dizziness or fainting comes with:
- chest pain, palpitations or a racing, irregular heartbeat;
- fainting during exertion, or collapse with injury;
- sudden breathlessness, or coughing up blood;
- vaginal bleeding with faintness, one-sided abdominal pain or shoulder-tip pain in early pregnancy, the warning pattern of an ectopic pregnancy;
- weakness of the face or limbs, slurred speech, or a seizure.
Contact your midwife or maternity unit the same day, urgently, if dizziness comes with a severe headache, visual changes such as flashing lights or blurring, pain just below the ribs, or sudden swelling of your face or hands after 20 weeks: together these are the warning signs of pre-eclampsia, which needs blood pressure and urine checks that day, not a video call.[1]
- Treated online: Assessment for the common patterns: light-headedness on standing, faintness in heat or after a missed meal, and dizziness lying flat, with blood tests for anaemia and glucose arranged; dizziness with chest pain, palpitations, severe headache, bleeding or a seizure, and any faint, need urgent care.
- What it is: a momentary fall in blood flow to the brain: blood pressure drops by about 10 points in mid-pregnancy as vessels relax, half of pregnant women feel light-headed on standing, and lying on the back after 20 weeks lets the womb press on the main vein.
- Triggers: standing quickly or for long, hot rooms and baths, missed meals and low blood sugar, dehydration from sickness, lying flat late on, anaemia, which affects about 1 in 4 pregnancies, and straining or coughing; most episodes have one of these behind them.
- First aid: at the first warning, sit with your head towards your knees or, better, lie on your left side with legs raised until the wave passes, then get up slowly; a sugary drink helps a missed-meal faint; after any faint get medical advice the same day.
- How long: an episode of light-headedness passes within a minute or two of sitting or lying down; the tendency is worst in the first and second trimesters and when lying flat in the third, and clears within days of the birth as blood pressure returns to normal.
- Emergency: call 112 for fainting with chest pain, palpitations, breathlessness, bleeding or a seizure, for a faint with a head injury, or for dizziness with a severe headache, visual disturbance, weakness or slurred speech, and say you are pregnant.
A video consultation suits dizzy spells without any of the urgent features above: the light-headedness on standing, hot-room faintness and missed-meal wooziness that pregnancy produces so reliably. If any red-flag feature is present, use 112 or your maternity unit first. If you actually faint and are injured, or faint repeatedly, be seen in person even if you feel fine afterwards.
Is dizziness normal in pregnancy?
Dizziness is common and usually harmless in pregnancy. Pregnancy hormones relax blood vessels and blood pressure often runs lower in the first and second trimesters, so standing up quickly, hot environments, long standing or missed meals can briefly starve the brain of blood flow and cause light-headedness. Dizziness with chest pain, palpitations, severe headache, visual changes or bleeding is not typical and needs urgent assessment.[3]
Between benign and urgent sits a practical question: is anything fixable driving it? Iron-deficiency anaemia, dehydration and blood-sugar dips are the three commonest fixable culprits, and all three respond to simple measures within days to weeks. That is what an assessment is for: not to wave the symptom away, but to sort its cause.
What causes dizziness and faintness in pregnancy?
Circulation changes and standing up
From early pregnancy, progesterone widens your blood vessels while your blood volume is still catching up, so blood pools in your legs when you stand and your pressure dips for a few seconds. The result is the classic head rush, greying vision or wobble on standing quickly, especially out of a warm bed or bath. It is the single commonest cause on this page and it is managed with behaviour, not medicine: stand in stages, and sit or lie down at the first warning.[3]
Lying flat in later pregnancy
From around the middle of pregnancy, lying flat on your back lets the weight of the womb compress the large vein returning blood to your heart, and after a few minutes you can feel faint, sweaty and sick. The fix is positional: lie on your side, ideally the left, and prop yourself with pillows. If you wake flat on your back, do not panic, just roll to your side; the faintness itself is the warning system working.
Low blood sugar, dehydration and heat
Pregnancy burns fuel faster and nausea disrupts eating, so long gaps between meals produce shakiness, sweating and light-headedness. Vomiting, hot weather and stuffy rooms all shrink the fluid side of the equation. Small frequent meals, a water bottle that travels with you, and escaping heat early are boring, effective treatment. Severe vomiting that stops you keeping fluids down is its own reason for same-day review.
Anaemia
Iron-deficiency anaemia builds gradually: dizziness plus unusual tiredness, breathlessness on mild effort, paleness and sometimes a pounding heart. It is common in pregnancy, it is picked up on the routine antenatal blood tests, and it responds well to treatment, so this cluster of symptoms is a blood-test conversation rather than something to soldier through.[2][3][5] If breathlessness is the louder half of your story, the page on breathing problems in pregnancy takes over from here.
The causes that must not be missed
Three patterns get named because missing them costs most. Dizziness or faintness with palpitations, chest pain or during exertion points to a heart rhythm or cardiac cause and needs urgent in-person assessment, not observation.[4] Faintness with vaginal bleeding or one-sided pain in early pregnancy raises ectopic pregnancy, a 112 situation described fully on the bleeding in pregnancy page. And after 20 weeks, dizziness in the company of severe headache, visual disturbance or sudden swelling is treated as possible pre-eclampsia until blood pressure and urine say otherwise.[1]
How urgent are your dizzy spells?
Swipe sideways to compare →
| Presentation | Likely first step | Suitable for online care? | When referral or in-person care is needed |
|---|---|---|---|
| Dizziness or fainting with chest pain, palpitations, or during exertion | Call 112 | No | Emergency, now[4] |
| Faintness with bleeding, one-sided pain or shoulder-tip pain in early pregnancy | Call 112 (possible ectopic pregnancy) | No | Emergency, now |
| Dizziness with severe headache, visual changes or sudden swelling after 20 weeks | Same-day urgent maternity review: blood pressure and urine checks (possible pre-eclampsia)[1] | No, beyond explaining urgency | Same day, always |
| Light-headed on standing, in heat, or after missed meals; settles quickly | Explanation and self-care: fluids, meals, staged standing | Usually yes | If episodes progress to actual faints, or gain other symptoms |
| Dizziness with marked tiredness, breathlessness on mild effort, paleness | Blood count to check for anaemia; treatment if confirmed[2] | Yes, with testing arranged locally | Severe symptoms, or anaemia not responding to treatment |
No red flags, but the dizzy spells keep coming? A doctor can tell you in one consultation.
See available times →How an online consultation helps with dizziness in pregnancy
- The red-flag screen, run properly: chest pain, palpitations, headache, vision, bleeding and movement questions come first, and any positive answer redirects you immediately, mid-call if needed.
- A likely cause and a clear plan: the pattern of your episodes usually identifies the mechanism, which converts a frightening symptom into a manageable one in a single conversation.
- The fixable found: suspected anaemia, dehydration from vomiting, and blood-sugar dips each get a concrete plan, with blood tests directed to a local service where needed.
- Medication reviewed: blood pressure tablets and other medicines carried into pregnancy sometimes overshoot as pregnancy lowers your pressure, and spotting that pattern is a genuine video-consultation win.
What the doctor checks in an online dizziness consultation
The consultation reconstructs your episodes precisely, because the details separate the causes:
- The trigger: standing, lying flat, heat, missed meals, exertion, or nothing at all, the most telling answer of the set.
- Warning and recovery: greying vision and sweating with quick recovery suggests a simple faint; no warning at all points harder at the heart.[4]
- Company: palpitations, chest pain, breathlessness, headache, visual changes, bleeding, weakness or speech change, each asked directly.
- Stage of pregnancy: early-pregnancy faintness with pain reads differently from third-trimester dizziness with swelling.
- Your numbers: recent blood pressure readings, home monitor values if you have them, and when your blood count was last checked.[2]
- Medicines: antihypertensives, antihistamines and anti-sickness tablets can all contribute, and doses sometimes need pregnancy-specific rethinking.
- Actual faints: how many, any injury, and whether anyone witnessed jerking or confusion afterwards, which changes the pathway.
The honest limit: a video call cannot measure your blood pressure lying and standing, test your urine for protein, or run an ECG. When your story needs those numbers, the consultation's product is a clear instruction about where to get them, and how urgently.
Treatment options for dizziness and faintness in pregnancy
What you can do yourself
Stand up in stages, especially from bed or a bath. At the first warning, sit and lower your head, or lie down and raise your legs: fighting a faint upright is how injuries happen. Eat small, frequent meals and carry snacks; keep water with you and drink through hot days; avoid long motionless standing and overheated rooms; and from mid-pregnancy, sleep and rest on your side rather than flat on your back. If you do faint, get checked the same day even if you feel recovered.
Prescription treatment
Honestly: dizziness in pregnancy is rarely treated with a medicine for dizziness. Treatment follows the cause: iron for confirmed anaemia after a blood count, fluids and anti-sickness treatment for severe vomiting, and specialist-led care for blood pressure and heart-rhythm problems, which are never started or adjusted online in pregnancy. What the doctor can also do is un-prescribe: flagging medicines that are overshooting as your pressure naturally falls, and arranging the in-person review to fix them.
When dizziness is treated online, and when you need in-person care
Treated online: typical positional and heat-related dizziness, with explanation and a prevention plan; suspected blood-sugar and hydration patterns; suspected anaemia, directed to testing and followed up; and review of dizzy spells in the context of your existing medicines.
In-person care: anyone whose answers include chest pain, palpitations, exertional collapse, bleeding with faintness, or neurological symptoms, to 112 immediately, including mid-consultation; dizziness with severe headache, visual changes or sudden swelling after 20 weeks, to same-day urgent maternity review for blood pressure and urine checks, the pre-eclampsia pathway explained further on the swelling in pregnancy page; repeated or injurious faints, to in-person examination and an ECG; and anything the video screen cannot measure that your story says must be measured. That honesty is the service: the consultation ends with the right door named, not with reassurance you did not earn together.
Building unfaintable days: fluid, food, heat and posture
Most pregnancy dizziness yields to four boring disciplines. Fluid first: aim to drink steadily through the day, more in heat, because pregnant circulation runs on generous volume and punishes dehydration quickly. Food second: long gaps between meals drop blood sugar into the same symptoms, so carry snacks that pair carbohydrate with protein and never skip breakfast.
Heat third: hot showers, crowded transport and standing queues stack the deck against you by widening blood vessels while blood pools in your legs; keep showers warm rather than hot, and claim a seat without apology. Posture last: rise from bed and chairs in stages, avoid lying flat on your back from mid-pregnancy, and if you must stand in one place, keep the calves pumping with small heel raises.
Track when episodes happen for a week and the trigger usually declares itself; that pattern is precisely what makes a video consultation about dizziness productive rather than vague.
How Mobi Doctor works
- Book a time that suits you: open daily 7am–11pm CET. You can see a doctor over video, usually within 15 minutes. No subscription, exact price up front.
- Speak to a licensed doctor about dizziness and faintness in pregnancy: a private video call from anywhere in Europe; the consultation always starts with the red-flag screen above, worked through together.
- Leave knowing your next step: an honest assessment, a clear plan, and a direct referral when in-person care is the right call, or a full refund.
No sign-up needed
Dizziness in pregnancy can have more than one cause. Tick every symptom you have to see each page that mentions it. It finds the right page, not a diagnosis: a doctor gives you that on a video call. If you have an emergency sign listed on this page, call 112 instead.
Tap the body — an area or a point — to browse symptoms anywhere
Not sure this is the right page? Look up any symptom in the full symptom checker, or book and describe it to a doctor.
Frequently asked questions about dizziness and faintness in pregnancy
Why do I feel dizzy during pregnancy?
Usually because pregnancy hormones relax your blood vessels and your blood pressure runs lower, so standing quickly, long standing, heat, missed meals or a hot bath leave the brain briefly short of blood; later, lying flat lets the womb compress the main vein returning blood to the heart. Dehydration from sickness, anaemia, low blood sugar and anxious fast breathing add to it. Dizziness is commonest in the first two trimesters.
What are the symptoms of faintness in pregnancy, and which ones matter?
Light-headedness, a swimmy head, blurred or greying vision, ringing ears, nausea, sweating and feeling hot or cold before an episode, followed by relief on sitting or lying down, is the ordinary pattern. Dizziness with chest pain, palpitations, breathlessness, a severe headache, visual disturbance, swelling, bleeding, abdominal pain, weakness on one side, slurred speech or a seizure is a different matter, and so is any actual loss of consciousness.
Is fainting during pregnancy dangerous?
A single simple faint with clear triggers, such as a hot room or a missed meal, is usually harmless to you and the baby, but after every actual faint get medical advice the same day, because fainting can occasionally signal anaemia, a heart rhythm problem, low blood sugar, bleeding or a clot, and because a fall can hurt you. Fainting with chest pain, palpitations, bleeding or a seizure is a 112 call.
When is dizziness a sign of pre-eclampsia?
Dizziness alone rarely is. The pre-eclampsia pattern is dizziness after 20 weeks in the company of severe headache, visual disturbance such as flashing lights or blurring, pain under the ribs, sudden swelling of the face and hands, or vomiting, and it is confirmed by blood pressure and urine checks at the maternity unit, where that combination should go without delay. Plain light-headedness on standing, with none of those, is the low-blood-pressure dizziness of normal pregnancy.
Can an online doctor help with dizziness in pregnancy?
Yes, for the common benign patterns: the doctor can identify the mechanism from your story, screen carefully for red flags, direct blood tests for anaemia and glucose that are drawn locally, review any medicines that lower blood pressure, and give a practical plan for fluids, food, heat and posture. A prescription is rarely needed and never issued without a consultation, and any faint with warning features is directed to urgent in-person care.
What helps quickly when I feel faint?
Sit down and put your head towards your knees, or better, lie down on your left side and raise your legs, until the faintness fully passes, then get up slowly in stages; a cold drink or a sugary snack helps if a missed meal or heat was the trigger. In a queue or on a train, cross your legs and tense the thighs and buttocks, which pushes blood back up, and ask for a seat.
What should I do the moment I feel faint while pregnant?
Get gravity on your side immediately: sit and put your head down, or better, lie on your left side, which takes the womb's weight off the main vein; loosen tight clothing, get air, and sip water or something sweet once the spinning eases. Tell someone nearby. If you actually faint, get medical advice the same day, and if there was chest pain, palpitations, bleeding or a head injury, call 112 rather than waiting.
How long does dizziness last in pregnancy?
A single episode of light-headedness passes within a minute or two of sitting or lying down, with a few minutes of wooziness afterwards. The tendency usually peaks in the first and second trimesters, when blood pressure is lowest, eases in the third apart from dizziness lying flat, and clears within days of the birth. Dizziness that is constant, spinning rather than faint, or worsening over days needs a different assessment.
What can I do myself to prevent faintness in pregnancy?
Drink through the day and more in heat, eat small regular meals and carry a snack, stand up slowly in stages and avoid standing still for long, keep rooms and baths warm rather than hot, sleep and rest on your left side from 20 weeks, wear support stockings if your legs pool blood, take any prescribed iron, and sit down the moment the first warning of faintness arrives rather than trying to push through it.
How can dizziness and fainting in pregnancy be prevented?
Most episodes are preventable by removing the trigger: hydration, regular meals, slow position changes, cool rooms, left-side rest and treating anaemia when a blood test confirms it; a blood count at booking and 28 weeks catches most anaemia before it causes faintness. The faints that lifestyle cannot prevent, those with palpitations or chest pain, are the ones that need an ECG and a heart check, so they are reported rather than managed at home.
Could anaemia or low blood sugar be causing my dizziness?
Both are common. Iron-deficiency anaemia affects about 1 in 4 pregnancies and causes dizziness with tiredness, breathlessness, palpitations and pallor; a blood count and ferritin test confirm it and iron restores energy over weeks. Low blood sugar from missed meals or morning sickness causes shaky, sweaty dizziness that a snack fixes quickly, and women with gestational diabetes on treatment can go low. The doctor directs the tests and reads the pattern.
Is it faintness, vertigo, low blood sugar or anaemia?
Faintness is a swimmy, greying-out feeling on standing or in heat that lying down cures. Vertigo is the room spinning, often with nausea, from the inner ear, and is not eased by lying down. Low blood sugar brings shakiness, sweating and hunger, fixed by food. Anaemia brings persistent dizziness with tiredness, breathlessness and pallor, found by a blood test. Dizziness with headache, visual change, chest pain or weakness needs urgent care.
- Hypertension in pregnancy: diagnosis and management (NG133), NICE, National Institute for Health and Care Excellence, 2019 (updated 2023).
- Anaemia, iron deficiency, NICE Clinical Knowledge Summaries, revised 2024.
- Antenatal care (NG201), NICE, National Institute for Health and Care Excellence, 2021.
- 2018 ESC Guidelines for the management of cardiovascular diseases during pregnancy, ESC, European Society of Cardiology, 2018.
- Anaemia: fact sheet, WHO, World Health Organization, accessed August 2026.
- Common health problems in pregnancy, NHS, National Health Service (UK), reviewed April 2024.
This page is for information only and is not a substitute for a medical consultation. Guideline links are provided for transparency; treatment decisions are made with your doctor.
Related conditions
From the Mobi Doctor podcast
The 10 Most Common Travel Illnesses
The travel illnesses doctors see most often in Europe, and how to handle each one away from home.
Listen · 23 Feb 2026 → Podcast · 13:26How to Stay Healthy on a Long Flight
Practical steps for circulation, hydration and infection risk before, during and after a long flight.
Listen · 23 Feb 2026 → Podcast · 15:41Debunking Gut Health Myths
What the evidence really says about gut health, and the popular claims that do not hold up.
Listen · 23 Feb 2026 →Speak to a doctor about dizziness and faintness in pregnancy over video, usually within 15 minutes
Licensed doctors · open daily 7am–11pm CET · exact price before payment
See available times →