Heart & Lung Problems in Pregnancy: Online Care

Key facts

Pregnancy raises the risk of blood clots and blood pressure problems; sudden breathlessness, chest pain or one-sided leg swelling is always urgent, never an online appointment.
Call 112 now for sudden breathlessness, chest pain, coughing blood, a seizure, or collapse.
Gradual breathlessness on exertion is common in pregnancy; blood volume rises by almost half and the heart works harder.
Severe headache, vision changes or sudden face and hand swelling after 20 weeks are pre-eclampsia warning signs: urgent review.
Clots in pregnancy favour the left leg; one-sided swelling or pain is checked the same day.

Check before you book

Do not book an online consultation for these. Sudden breathlessness, chest pain, coughing blood, or collapse: call 112 now, these can be a pulmonary embolism or heart emergency. A swollen, painful or hot calf, usually one-sided, needs same-day hospital assessment for a clot. Severe headache, vision changes, pain under the ribs or sudden swelling of your face and hands after 20 weeks: contact your maternity unit urgently, these are pre-eclampsia signs. A seizure in pregnancy is always 112.

Can an online doctor help with heart and lung symptoms in pregnancy?

An online doctor can help sort the expected breathlessness, ankle swelling, dizziness and varicose veins of pregnancy from the warning signs of blood clots, pre-eclampsia and heart problems, and can advise on the everyday symptoms once red flags are excluded. The dangerous presentations, including sudden breathlessness, chest pain and one-sided leg swelling, need emergency or same-day hospital care, not a video call, and assessment pathways vary by country.

That is a narrower promise than on most of our pages, and it is deliberate. Pregnancy changes the circulation profoundly: blood volume rises by almost half, the heart works harder, hormones relax blood vessel walls, and blood clots more readily, a protective adaptation for birth with a known cost, a higher risk of deep vein thrombosis and pulmonary embolism through pregnancy and the weeks after delivery.^[2]^[4] Most symptoms this produces are benign. A few are among the leading causes of serious harm in pregnancy, which is why this page leads with recognition rather than reassurance.

What we treat online for heart and lung problems in pregnancy, and what needs in-person care

Usually handled online: the benign, pattern-true symptoms of a hard-working pregnant circulation.

Dizziness and faintness: positional patterns explained and managed
Swelling (oedema) in pregnancy: evening ankle swelling assessed and eased
Varicose veins in pregnancy: compression, elevation and honest expectations

Assessed online, but often needs in-person or urgent care: four pages in this section are recognition guides first, because their dangerous causes cannot be excluded by video.

Breathing problems in pregnancy: gradual breathlessness is reviewed online, but sudden breathlessness is a 112 call for possible pulmonary embolism
Deep vein thrombosis in pregnancy: one-sided leg swelling or pain needs a same-day hospital scan, never a video diagnosis
Heart issues in pregnancy: chest pain, fainting or breathlessness at rest needs an ECG and in-person tests
High blood pressure in pregnancy: readings and pre-eclampsia checks belong with your maternity team

Pages in this section

Which heart and lung symptoms are normal in pregnancy?

Gradual, mild breathlessness on exertion is one of pregnancy's most common experiences: hormones drive you to breathe more deeply from early on, and later the growing uterus leaves the lungs less room. Ankle and foot swelling that affects both sides, builds through the day and eases overnight is equally ordinary, as are visible varicose veins, occasional skipped or extra heartbeats, and feeling faint when standing quickly or lying flat on your back, which lets the uterus press on the large vein returning blood to the heart.

The pattern is what separates normal from notable: normal symptoms come on gradually, track with exertion, position or the time of day, and settle with rest or a change of position. Symptoms that arrive suddenly, at rest, on one side, or with pain break that pattern, and pattern-breaking is precisely what a video consultation can establish quickly, because it lives in the history rather than the examination.

How do I tell normal swelling from a clot or pre-eclampsia?

Location and speed. Normal pregnancy swelling is both ankles, slow, painless and better each morning. A deep vein thrombosis is typically one leg, most often the left, with swelling, pain, warmth or colour change in the calf, and it needs same-day hospital assessment because part of a clot can travel to the lungs.^[2] If that happens, a pulmonary embolism, the signs are sudden breathlessness, chest pain that is worse on breathing in, coughing blood, or collapse, and the response is 112, immediately, every time.^[3]

Pre-eclampsia swells differently: face and hands, arriving suddenly, typically after 20 weeks, in company with severe headache, visual disturbance such as flashing lights, pain under the ribs, or simply feeling abruptly unwell. It is a blood pressure disorder of pregnancy that can escalate quickly, which is why those symptoms mean urgent maternity assessment and blood pressure measurement rather than watchful waiting.^[1] High blood pressure found at an antenatal check belongs with your maternity team even when you feel perfectly well; our high blood pressure in pregnancy guide explains what the numbers mean and how monitoring works.

Online care or urgent care for heart and lung symptoms?

This table is the page's core message. When in doubt, take the urgent column.

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Heart and lung symptoms in pregnancy: what suits online assessment and what is urgent, aligned with cited guidance
Situation	Likely first step	Suitable for online care?	Where to go instead
Gradual mild breathlessness on exertion, otherwise well	History review to confirm the benign pattern	Usually yes	In-person review if it arrives suddenly or at rest
Both ankles swelling by evening, easing overnight; varicose veins	Compression, elevation and movement advice	Yes	Same-day review if swelling becomes one-sided or painful
Feeling faint on standing or lying flat; brief fluttering palpitations	Pattern review and practical advice; further checks if frequent	Often yes	In-person tests for palpitations with fainting, chest pain or breathlessness
One-sided calf swelling, pain, warmth or colour change	Same-day hospital assessment for suspected DVT^[2]	No	Maternity unit or emergency department today
Sudden breathlessness, chest pain, coughing blood, severe headache with vision changes, or collapse	Emergency care^[1]^[3]	No	Call 112 now

Availability of individual medicines and who may prescribe them vary by country; your doctor confirms what applies where you are.

On the everyday side of the table, but still unsure? A doctor can tell you in one consultation.

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What our doctors help with here

Recognition and routing, first and always: a deliberate red-flag screen for clots, pre-eclampsia and cardiac symptoms before anything else is discussed.
The benign majority, properly explained: why you are breathless on stairs, why your ankles swell, why lying on your back makes you faint, and what actually helps.
Varicose veins and swelling plans: compression, elevation, movement and sleep positions, with honest expectations about what resolves after birth.
Blood pressure sense-making: what your antenatal readings mean, how to measure correctly at home if asked to, and which numbers or symptoms mean calling your maternity unit.
Clot risk awareness: understanding personal risk factors such as immobility and long journeys, and the leg and breathing symptoms that must never be slept on.

When we send you to maternity services instead

We route you out of online care, immediately and explicitly, for suspected DVT, meaning one-sided leg swelling, pain, warmth or colour change; any sudden breathlessness, chest pain or coughing of blood, which is a 112 call for possible pulmonary embolism; pre-eclampsia symptoms, meaning severe headache, visual disturbance, pain under the ribs, sudden face or hand swelling, or raised readings, which go urgently to your maternity unit; palpitations with fainting, chest pain or breathlessness, which need an ECG; and any seizure, which is 112. In these situations we do not offer an online consultation as a first step, because the honest first step is a hospital, and no consultation fee should ever sit between you and it. If the doctor can't treat you online, you get a full refund and clear directions to the right care. The wider category overview lives at pregnancy-related conditions.

When to get in-person care

Call 112 now for sudden breathlessness, chest pain, coughing blood, a seizure, or collapse. Go to your maternity unit or an emergency department today for one-sided calf swelling, pain or warmth. Contact your midwife or maternity unit urgently for severe headache, vision changes, pain under the ribs, sudden swelling of your face or hands, or a change in your baby's movements. None of these should ever wait for an online appointment.

What your heart and lungs are actually doing in pregnancy

By the third trimester your blood volume has grown by roughly half, your heart pumps noticeably more with every beat, and your breathing moves more air even at rest. These are healthy adaptations, but they explain almost everything this section deals with: the pounding you notice lying on your left side, the breathlessness on stairs that used to be nothing, the swollen ankles at day’s end and the visible veins.

The same adaptations also explain why doctors take small signals seriously. A system running this close to its design limits has less spare capacity, so a clot, rising blood pressure or true heart strain shows itself faster. That is why every page in this section draws the same line: gradual, position-dependent and settling with rest usually belongs to healthy adaptation; sudden, progressive or accompanied by pain, faintness or one-sided leg swelling belongs in front of a doctor the same day.

Bring specifics to any consultation: what you were doing when it happens, how long it lasts, and what ends it. Patterns diagnose better than adjectives here.

How Mobi Doctor works

Book a time that suits you: open daily 7am–11pm. Most patients speak to a doctor within about 15 minutes of their booked time. no subscription, exact price up front.
Speak to a licensed doctor about heart and lung problems in pregnancy: a private video call: you describe what you feel, the doctor asks what matters, and you agree the right plan together.
Leave with your plan: everything agreed before you hang up: your plan, and a prescription to use at a pharmacy near you where medication is clinically right for you. If we can't help you online, you get a full refund.

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Could it be something else?

Tick what you feel to see every condition page that mentions it. It finds the right page, not a diagnosis: a doctor gives you that on a video call.

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Frequently asked questions about heart and lung problems in pregnancy

Can an online doctor assess breathlessness or swelling during pregnancy?

Yes, when it fits the gradual, exertion-related pattern that is normal in pregnancy: the doctor reviews your history by video, confirms the benign pattern and advises what helps. Sudden breathlessness, breathlessness at rest, chest pain or one-sided leg swelling are not online presentations; they need emergency or same-day hospital care.

How much does a consultation cost, and how quickly can I be seen?

The exact price of a video consultation is shown before payment, and there is no subscription. Appointments are available daily from 7am to 11pm, often within about 15 minutes. For the emergency symptoms named on this page, call 112 or go to your maternity unit instead of booking.

Why are blood clots more likely in pregnancy?

Blood clots more readily in pregnancy, a natural preparation for birth, while the growing uterus slows blood returning from the legs. Together these raise the risk of deep vein thrombosis during pregnancy and in the weeks after delivery, which is why one-sided leg swelling or pain always needs same-day assessment.

What are the warning signs of pre-eclampsia?

Severe headache, vision changes such as flashing lights or blurring, pain just under the ribs, sudden swelling of the face or hands, and feeling suddenly unwell, typically after 20 weeks. Any of these means contacting your midwife or maternity unit urgently for blood pressure and urine checks, even if you feel it might be nothing.

Are palpitations normal when pregnant?

Occasional brief flutters or skipped beats are common in pregnancy because the heart is working harder, and they are usually harmless. Palpitations that come with chest pain, breathlessness, faintness or blackouts, or that are sustained and fast, need in-person assessment with an ECG rather than an online appointment.

Is it safe to fly during pregnancy, and does flying raise my clot risk?

Yes, for most uncomplicated pregnancies flying is considered safe, although airlines set their own limits in late pregnancy, so check before booking. Because pregnancy already makes blood clot more readily, long journeys of four hours or more deserve precautions: drink water, move or flex your legs regularly, and ask a doctor whether compression stockings would suit you. Discuss any clot history or complications first.

How do I tell normal pregnancy breathlessness from something serious?

Normal pregnancy breathlessness builds gradually, appears on exertion or when the bump crowds your lungs, and eases with rest and position changes. The serious kind arrives suddenly or keeps worsening, comes with chest pain, a racing heart at rest, coughing blood, faintness, or one swollen painful leg, and does not care what position you sit in. The first pattern suits a calm video review; any feature of the second means same-day emergency assessment, because clots in pregnancy behave exactly like that.

Sources & further reading

Hypertension in pregnancy: diagnosis and management (NG133), NICE, National Institute for Health and Care Excellence, 2019 (updated 2023).
Deep vein thrombosis, NICE CKS, Clinical Knowledge Summaries, reviewed 2024.
Pulmonary embolism, NICE CKS, Clinical Knowledge Summaries, reviewed 2024.
ESC Guidelines for the management of cardiovascular diseases during pregnancy, ESC, European Society of Cardiology, 2018.

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.