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Dr. Chrysoula I. Liakou MD, PhD
- Treated online: Yes, usually. Nasal congestion is assessed by video and its cause treated, with a steroid nasal spray or antihistamine prescribed for allergic or persistent congestion; a one-sided blockage with bleeding needs in-person care.
- What it is: swelling of the lining inside the nose that narrows the airway; mucus is usually the smaller part of the blockage, which is why blowing harder rarely helps.
- Commonest causes: colds and other viral infections, allergic rhinitis (hay fever, dust mites, pets), sinusitis, rebound from decongestant sprays, pregnancy, and a deviated septum or nasal polyps.
- How long: congestion from a cold clears within about 10 days; anything longer suggests allergy, sinusitis, rebound congestion or a structural cause.
- Sprays: decongestant sprays for no more than 5 to 7 days, because longer use causes rebound congestion; steroid sprays are the most effective treatment for allergic congestion but build their full effect over 1 to 2 weeks.
- Emergency: call 112 if a blocked nose comes with severe headache, a stiff neck, vision changes or swelling around an eye.
A blocked nose is rarely an emergency, but a few patterns need in-person care rather than a video call. See a doctor in person for a persistently one-sided blockage with bleeding or crusting, facial or eye swelling with a blocked nose, or clear watery fluid dripping from the nose after a head injury. A baby who is so congested that feeding or breathing is difficult also needs prompt assessment. If a blocked nose comes with severe headache, a stiff neck, vision changes or swelling around an eye, call 112 or seek emergency care.
Can an online doctor treat nasal congestion?
Yes. Nasal congestion is a symptom rather than a diagnosis, so a video consultation focuses on why the nose is blocked: a licensed doctor takes a history, looks at the pattern of symptoms, and can prescribe a steroid nasal spray or antihistamine where the cause is allergy or inflammation. Congestion is very treatable online, and the doctor tells you when a blockage needs in-person examination instead.
Most congestion comes down to a handful of causes that a good history distinguishes well: an ordinary cold, allergy, sinus inflammation, or long-term rhinitis. Because the diagnosis rests on the story rather than a physical examination, video assessment suits it, and it lets the doctor prescribe the right treatment, which for a stubborn blocked nose is often a prescription-strength spray rather than another over-the-counter product.
How an online consultation helps with nasal congestion
- Allergy or infection, sorted: the doctor works out whether your blocked nose is allergic, viral or from sinus inflammation, because the three are treated in completely different ways and guessing wastes weeks.
- Prescriptions after a consultation: where the cause calls for it, the doctor can prescribe a steroid nasal spray or a non-sedating antihistamine and give you a prescription you can use at a pharmacy near you, going beyond what the pharmacy shelf offers.
- The decongestant-rebound trap explained: if a spray has stopped working or made things worse, the doctor recognises rebound congestion and sets out a clear plan to break the cycle.
- A safety net for the rare serious causes: you leave knowing which features (one-sided blockage with bleeding, facial or eye swelling) mean an in-person look rather than another spray.
What causes a blocked nose?
Congestion happens when the lining of the nose swells and produces mucus, narrowing the airway. The common causes are:
- Colds and viral infections: the most frequent cause, usually settling within about 10 days as the infection clears.[2][4]
- Allergic rhinitis: an allergic reaction to pollen, dust mites, pets or mould, driving congestion along with sneezing, itch and a clear runny nose.[1]
- Sinusitis: inflammation of the sinuses, adding facial pain or pressure and often thicker, discoloured discharge, especially when congestion drags past 10 days.[3]
- Non-allergic rhinitis: a nose that reacts to temperature changes, strong smells, alcohol or hormonal shifts without a true allergy.
- Rebound congestion: from overusing decongestant nasal sprays, covered in detail below.
- Structural causes: a deviated septum, nasal polyps or enlarged adenoids in children, which tend to cause a more constant or one-sided blockage.
Is my blocked nose an allergy or an infection?
Allergy and infection are the two causes people most often confuse, and telling them apart changes the treatment entirely. Allergic congestion tends to come with sneezing, an itchy nose, eyes or throat, and a clear watery discharge; it often follows a pattern, worse outdoors in pollen season, or worse in a dusty or pet-filled room, and it can persist for weeks or return every year. Infective congestion from a cold usually arrives with a sore throat or cough, may bring a mild fever, produces mucus that can thicken and change colour, and follows the rise-and-fall course of an illness that clears within a week or two.[1][2]
The overlap is real, which is why a history matters. Itch and sneezing point towards allergy; a defined illness with other cold symptoms points towards infection; and congestion that has outstayed a cold, or that flares predictably with exposure, is where an assessment earns its keep. If the picture is allergic, a persistent problem such as hay fever and other allergic rhinitis is treated very differently from a passing cold, usually with a steroid nasal spray rather than a decongestant.
Decongestant sprays and rebound congestion
This is the single most important thing to understand about treating a blocked nose. Decongestant nasal sprays (containing xylometazoline or oxymetazoline) work quickly and can feel like a miracle, but they must not be used for more than about five to seven days in a row.[1][5] Used for longer, they cause rebound congestion, known medically as rhinitis medicamentosa: the nose becomes dependent on the spray, blocks up worse than before as each dose wears off, and drives you to spray more often, in a loop that can run for months. It is a common and genuinely frustrating problem, and the treatment is not a stronger decongestant.
Breaking the cycle means stopping the decongestant spray, which is uncomfortable for a week or two while the nose recovers, often with a steroid nasal spray started to calm the lining and ease the transition. A doctor can plan this with you, explain what to expect, and prescribe the steroid spray where appropriate. The lasting lesson is to treat ongoing congestion with a steroid spray, saline or antihistamine rather than reaching repeatedly for a fast-acting decongestant.
How doctors decide the cause and the treatment
Whether a blocked nose needs self-care, a prescription or an in-person look depends on the likely cause and how long it has lasted. The table below shows how doctors sort it.
Swipe sideways to compare →
| Congestion presentation | Likely first step | Suitable for online care? | When referral or in-person care is needed |
|---|---|---|---|
| Blocked nose with a cold, under 10 days, other cold symptoms | Saline, short-term decongestant, and a safety net | Usually yes | If it lasts beyond 10 days or clearly worsens |
| Sneezing, itch and clear discharge, seasonal or exposure-linked | Steroid nasal spray or antihistamine for allergic rhinitis[1] | Yes | Poor response, or asthma that needs review alongside |
| Congestion over 10 days with facial pain or discoloured discharge | Assess for sinusitis and treat accordingly | Yes, for assessment | Eye or facial swelling, vision change, or severe headache |
| Worsening congestion after prolonged decongestant spray use | Stop the spray; steroid nasal spray to break rebound | Yes | Congestion that persists after stopping the spray |
| Persistent one-sided blockage with bleeding, or facial or eye swelling | Prompt in-person examination | No | In person, and 112 for eye swelling or vision change |
Not sure which row is you? A doctor can tell you in one consultation.
See available times →What the doctor checks in an online nasal congestion consultation
The assessment is a structured history aimed at pinning down the cause. In a congestion consultation the doctor will typically check:
- How long it has lasted: days, weeks or months, and whether it is constant or comes and goes.
- The company it keeps: sneezing and itch (suggesting allergy), fever and sore throat (suggesting a cold), or facial pain and discoloured mucus (suggesting sinusitis).
- One side or both: a persistently one-sided blockage is treated more cautiously and may need examination.
- Triggers and timing: pollen seasons, pets, dust, workplace exposures, or a nose that reacts to cold air, smells or alcohol.
- What you have already used: especially decongestant sprays, and for how long, to spot rebound congestion.
- Your background: asthma, eczema or hay fever, previous nasal surgery, and any recent head injury.
- The effect on you: sleep, and whether you have lost your sense of smell, which points towards polyps or significant inflammation.
Treatment options for nasal congestion
What you can do yourself
Saline sprays or rinses are safe, effective and can be used as often as you like to loosen mucus and settle the lining; they are a genuinely useful first step for almost any blocked nose. Steam inhalation can feel soothing for a short while, though the evidence that it changes the course of congestion is limited, so treat it as comfort rather than cure and take care to avoid scalds. Keeping hydrated, airing rooms, and reducing exposure to a known allergen all help. A short course of a decongestant spray is fine for a few days during a cold, provided you respect the five-to-seven-day limit.[5]
Prescription treatment after your consultation
A prescription is never issued without a consultation. Where the cause is allergic rhinitis or persistent inflammation, the mainstay is a steroid nasal spray, which works best used regularly over days to weeks rather than expecting instant relief, and the doctor can prescribe one and show you how to use it correctly.[1] A non-sedating antihistamine helps allergic congestion with sneezing and itch. If sinusitis is the cause, treatment follows that pathway, and antibiotics are only prescribed where a bacterial infection is genuinely suspected, not for ordinary viral congestion.
When nasal congestion is treated online, and when you need in-person care
Treated online: congestion from colds needing self-care and a safety net; allergic rhinitis that benefits from a steroid nasal spray or antihistamine; rebound congestion from decongestant overuse, where the plan is to stop the spray and settle the lining; and congestion crossing into sinusitis that can be assessed and treated.
In-person care: a persistently one-sided blockage with bleeding or crusting, which needs an in-person nasal examination; suspected nasal polyps or a structural problem for which an ear, nose and throat opinion helps; facial or eye swelling, vision changes or severe headache, which are urgent; and clear fluid from the nose after a head injury. In those cases the consultation directs you to the right care. A blocked nose is one of the most common cold and flu symptoms the doctors assess online, and it often travels with the common cold.
When to get in-person care
See a doctor in person for a blocked nose that is persistently one-sided with bleeding or crusting, a lost sense of smell that does not return, or congestion that never fully clears despite treatment. Get urgent care, and call 112, if a blocked nose comes with swelling around an eye, changes in vision, a severe headache with a stiff neck, or clear watery fluid leaking from the nose after a head injury. These are uncommon, but they need assessment that a video call cannot provide.
Treating a blocked nose at home: what helps and what does not
Home care handles most blocked noses: saline rinses or sprays, steam if it comforts you, staying hydrated, sleeping slightly propped up, and short pharmacy decongestant courses used only as the pack directs, because overusing them causes rebound blockage.
What home care cannot do: it cannot explain a blockage that stays. Congestion beyond three weeks, blockage affecting one side only, repeated nosebleeds from the same side, facial pain or a smell disturbance that persists all deserve a doctor’s look, because chronic sinusitis, polyps and other structural causes need more than steam.
You do not have to leave home for that step either: a video consultation is at-home care with a licensed doctor in it, and if treatment is right for you, the prescription can be used at a pharmacy near you. You can see a doctor over video, usually within 15 minutes. Book a video consultation: no subscription, exact price before payment.
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 nasal congestion: 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 your doctor decides you need to be seen in person, you get a full refund.
No sign-up needed
A blocked nose can have more than one cause. Tick every symptom you have to see each condition page that mentions it. It finds the right page, not a diagnosis: a doctor gives you that on a video call.
Tap the body — an area or a point — to browse symptoms anywhere
Similar symptoms, different condition? Hay Fever can start the same way. Compare them, or look up any other symptom in the full symptom checker.
Frequently asked questions about nasal congestion
What causes a blocked nose?
Nasal congestion is caused by swelling of the lining inside the nose, not just mucus. The commonest triggers are colds and other viruses, allergic rhinitis from pollen, dust mites or pets, sinusitis, and rebound swelling from decongestant sprays used too long. Pregnancy hormones, a deviated septum, nasal polyps, some blood-pressure medicines and dry or smoky air also block the nose.
Why is my nose blocked but I have no cold?
Nasal congestion without a cold usually means allergy, non-allergic rhinitis triggered by temperature changes, smoke or perfume, rebound congestion from sprays, pregnancy, or a structural cause such as a deviated septum or polyps. Congestion that is worse indoors, at night or in particular seasons points to allergy; a constant one-sided block points to structure and needs examination.
Is my blocked nose an allergy or an infection?
Allergic nasal congestion tends to come with sneezing, an itchy nose or eyes and clear discharge, and often follows pollen seasons or exposure to dust or pets. A cold usually brings a sore throat or mild fever and clears within a week or ten days. Sinusitis adds facial pressure and thick discharge and lasts longer. The pattern over time, plus the triggers, usually settles it.
How do I unblock my nose quickly?
To relieve nasal congestion quickly, rinse or spray the nose with salt water, breathe steam from a hot shower, sleep with your head raised, keep the air humid, drink plenty, and use a decongestant spray for a few days at most. A steroid spray works better for allergic congestion but takes days to build, and an antihistamine helps when sneezing and itching come too.
Why is my nose more blocked after using a decongestant spray?
This is rebound congestion, or rhinitis medicamentosa. Decongestant sprays used for more than about a week make nasal congestion worse as each dose wears off, so you use more, in a self-feeding cycle. The fix is to stop the spray, accept a few blocked days, and bridge with salt water and a steroid spray, which the doctor can prescribe.
Why does my nose block at night or when lying down?
Nasal congestion worsens lying down because blood pools in the swollen nasal lining and mucus no longer drains by gravity. Dust mites in bedding, a dry bedroom, evening alcohol and reflux add to it. Raising the head of the bed, washing bedding hot, using a salt-water rinse before bed and treating allergy with a steroid spray usually fix a night-time block.
Can an online doctor prescribe treatment for nasal congestion in Europe?
Yes, after a consultation. Where the cause of the nasal congestion is allergic rhinitis or persistent inflammation, the doctor can prescribe a steroid nasal spray or a non-sedating antihistamine and send the prescription to a pharmacy near you. Ordinary viral congestion gets a symptom plan rather than a prescription, because it clears on its own.
Do steroid nasal sprays actually work for congestion?
Yes, for allergic and inflammatory nasal congestion they are the most effective treatment, but they work gradually. Used correctly and regularly, aimed away from the middle of the nose, they reach their full effect over one to two weeks rather than instantly, so they reward patience. They are safe for long-term use at the usual doses, unlike decongestant sprays.
How long should a blocked nose last?
Nasal congestion from a cold usually eases within about 10 days. A blocked nose lasting longer suggests something other than a passing infection, such as allergic rhinitis, sinusitis or rebound congestion from spray overuse. Persistent congestion is worth a consultation, because each of those has a treatment, and a block that never clears on one side needs an examination.
When should I worry about a blocked nose?
Most nasal congestion is harmless. See a doctor in person for a persistently one-sided blockage with bleeding or crusting, a lost sense of smell that does not return, or congestion that never clears. Seek urgent care, or call 112, for swelling around an eye, vision changes, a severe headache with a stiff neck, or clear fluid dripping from the nose after a head injury.
Is a blocked nose in pregnancy normal, and what can I use?
Yes. Pregnancy rhinitis, nasal congestion caused by pregnancy hormones swelling the nasal lining, affects up to a fifth of women, usually in the second half of pregnancy, and clears within two weeks of birth. Salt-water rinses, raising the head of the bed and steam are the first steps; a steroid spray can be used after checking with a doctor, and decongestant tablets are avoided.
How can I prevent a blocked nose coming back?
Prevent recurrent nasal congestion by treating allergy before the season with a steroid spray, reducing dust mites with hot washing and covers, keeping pets out of the bedroom, not smoking, humidifying dry rooms in winter, rinsing with salt water after exposure, and never using a decongestant spray for more than a week. Polyps or a deviated septum need an ear, nose and throat assessment.
- Allergic rhinitis, NICE CKS, Clinical Knowledge Summaries, reviewed 2024.
- Common cold, NICE CKS, Clinical Knowledge Summaries, reviewed 2024.
- Sinusitis, NICE CKS, Clinical Knowledge Summaries, reviewed 2024.
- Common cold, HSE, Health Service Executive (Ireland), accessed August 2026.
- Nasal decongestants in monotherapy for the common cold, Cochrane, Cochrane Collaboration, 2016.
- Non-allergic rhinitis, NHS, National Health Service (UK), accessed October 2026.
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.
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