If your nose has been blocked for months or years rather than days, you do not have a cold. You have one of about eight things, and they need completely different treatment. That is the whole problem with persistent nasal congestion: the symptom is identical whatever the cause, so people cycle through pharmacy remedies for a decade without ever finding out which one they actually have.
I see this constantly. Someone comes in having tried four different sprays, two antihistamines and a course of steam inhalation, none of which worked, because their problem was never inflammatory in the first place.
Here is how to narrow it down.
The eight causes
Allergic rhinitis. A stuffy nose with sneezing, itching, and a clear runny nose. Often seasonal, in which case you will know it as hay fever, but house dust mite and pet allergy run all year. Both sides, usually.
Non-allergic rhinitis. Identical symptoms, negative allergy tests. Triggered by temperature changes, strong smells, alcohol, spicy food, sometimes by blood pressure medication. Commoner than people think and frequently missed.
A deviated septum. The wall between your nostrils is off centre. One side is worse, consistently and permanently. Often traceable to a nasal injury, though plenty of people are simply born with one and many injuries are too minor to remember.
Turbinate hypertrophy. The ridges on the side wall of your nose are permanently enlarged. Both sides, worse lying down, often alongside long-standing allergy. This is also the classic finding in people who have overused decongestant sprays.
Nasal valve collapse. The narrowest part of the airway, just inside the nostril, draws inwards when you breathe in hard. You will notice it most when exercising. If pulling your cheek gently outwards makes breathing suddenly easier, this is likely part of your picture.
Nasal polyps. Soft swellings growing from the sinus lining. The distinguishing feature is loss of smell, which usually comes before the blockage becomes severe. Both sides. If your sense of smell has genuinely gone, this moves to the top of the list.
Chronic rhinosinusitis. Long-standing inflammation of the sinuses as well as the nasal passages. Blockage with facial pressure, thick discharge, reduced smell, and repeated sinus infections. Unlike a one-off infection after a cold, this persists for months. It is one of the commonest causes of chronic nasal congestion and it is frequently mistaken for stubborn allergies.
Rebound from decongestant nasal sprays. Xylometazoline or oxymetazoline used beyond about a week causes the nose to swell harder each time the dose wears off. Recognised as rhinitis medicamentosa. Both sides, severe, and it gets worse the more you treat it.
When it is an infection, and when to worry
Most blockage that arrives with a fever, facial pain and coloured discharge is an ordinary viral infection and settles within ten days. Bacterial sinusitis is suspected when symptoms last beyond ten days, or improve and then clearly worsen.
Learn to recognise the pattern that needs same-day care rather than patience: a high fever with severe one-sided facial pain, swelling or redness around the eye, changes in vision, or a severe headache with neck stiffness. Those are uncommon, and they need assessment rather than another week of nasal sprays.
How to work out which one is yours
Four questions do most of the sorting.
Is it one side or both? Consistently one side points to structure: a deviated septum, or a valve problem on that side. Both sides points to lining: allergy, rhinitis, polyps, or spray rebound. Alternating sides is usually the normal nasal cycle showing up because the airway is narrow to begin with.
Can you smell properly? This is the most useful single question I ask. Genuine loss of smell, not just muffled when blocked, strongly suggests nasal polyps or chronic sinus inflammation. A structurally narrow nose does not usually take your smell away.
Does it change, ever? A structural blockage is boringly consistent. It is there in July and in January, in the countryside and in the city. Anything that varies with season, location, pets, or weather is inflammatory, and inflammation responds to medication.
Have you used a decongestant spray for more than a fortnight? If yes, that is the first thing to sort out, whatever else is going on. Nothing can be assessed properly through rebound congestion, and it is reversible.
Why "I tried a spray and it didn't work" proves less than you think
Two reasons.
Most people use steroid sprays wrongly. The spray should be aimed outwards, towards the corner of the eye on the same side, using the opposite hand. Aimed straight up the middle it hits the septum, which does nothing useful and causes nosebleeds. And it is not a rescue treatment: it takes a couple of weeks of daily use before you can judge it.
The second reason is more fundamental. A steroid spray reduces swelling. If your blockage is a bent piece of cartilage and bone, there is no swelling to reduce, and no amount of correct technique will help. Failing to respond to a properly used spray is genuinely useful information: it points towards structure.
What "I can't breathe through my nose" usually turns out to be
In my clinic, the commonest single finding is a combination rather than one thing: a deviated septum with enlarged turbinates on the opposite side. The septum bends one way, the turbinate on the roomier side grows to fill the space, and you end up with both sides restricted for different reasons.
This is exactly why treating one component alone disappoints people. Straighten the septum and leave a large turbinate, and the improvement is partial. It also explains why so many people report that surgery elsewhere "half worked".
The second commonest is allergy sitting on top of a mild structural narrowing. Neither alone would trouble you. Together they cross the threshold where you notice.
What a proper assessment involves
It is quicker and less unpleasant than people expect.
I look inside with a thin flexible camera. That takes a couple of minutes and shows the septum, the turbinates, the back of the nose, and whether there are polyps. Then I decongest the nose with a spray and look again. The difference between the two views is the answer to the central question: how much of your blockage is swelling, which medication can fix, and how much is structure, which it cannot.
If allergy is likely, testing is worth doing rather than guessing, because the treatment differs. If polyps or sinus disease are found, a CT scan is usually the next step.
What I am not doing is looking up your nose with a torch and offering an opinion. The narrow part is further back than a torch reaches.
When surgery is the answer, and when it isn't
Surgery fixes structure. It does not fix allergy.
If your nose is blocked because of a deviated septum, septoplasty is a reliable operation and most people notice the difference within a few weeks. If enlarged turbinates are contributing, reducing them at the same time makes sense. If the outer nose is visibly bent as well as the septum, straightening the inside alone tends to under-deliver, and a septorhinoplasty addresses both the airway and the shape.
If your nose is blocked because of allergy or non-allergic rhinitis, an operation will help less than you hope and the benefit tends to fade. Medical treatment first, properly, for long enough to judge it.
The honest position is that a good assessment often ends with me telling someone they do not need an operation. That is a legitimate outcome of the appointment, and it is the one I would want for myself.
What to do next
If your nose has been blocked for more than three months, work through it in this order:
- Stop any decongestant spray you have been using for more than a week, and give it a fortnight
- Use a saline rinse daily
- Use a steroid spray with the correct technique for two to four weeks
- If there is any seasonal or pet-related pattern, get allergy testing
- If none of that shifts it, or if one side is always worse, get it looked at with a camera
Steps one to four are things you can do without me. Step five is where a specialist opinion earns its keep, because that is the point at which you need to know whether you are dealing with swelling or with structure.
Relief you can try at home
Steam, a warm shower, and sleeping propped up all give short-term relief without treating the underlying condition. Saline rinses with warm water are the one home measure that genuinely helps prevent symptoms rather than just easing them, and the treatments that follow work better on a nose that has been rinsed first.
However, none of this changes a structural narrowing. If home measures have been tried honestly and your health is still affected month after month, the cause is worth establishing properly. A true allergic reaction, with itching and watering eyes, points one way. Blockage caused by anatomy, due to a bent septum or enlarged turbinates, points another. The two are managed completely differently, which is why the list of common causes above includes both categories rather than one.
If any of this is causing you to breathe through your mouth at night, or leaving you with a dry throat in the mornings and disturbed sleep, that is worth taking seriously rather than accepting. Night-time blockage that clears by morning has its own explanation, and it is covered in is it dangerous to sleep with a blocked nose.
Frequently asked questions
Why is my nose always blocked but no mucus comes out?
Blockage without discharge is usually swelling of the lining or a structural narrowing rather than mucus. It is a very common pattern with turbinate enlargement and with a deviated septum.
Why does my nose feel blocked even when I can breathe?
The sensation of airflow is partly driven by nerve endings that respond to cooling, not just by the volume of air. Some people have a genuinely open nose that still feels blocked. It is worth having it examined so you can stop worrying about an obstruction that is not there.
Can a blocked nose be permanent?
A structural cause will not resolve by itself, so in that sense yes. It is also very treatable. Inflammatory causes fluctuate and usually respond to medication.
Is a constantly blocked nose serious?
Rarely, in itself. Persistent blockage on one side only, particularly with bleeding, facial numbness or a change in smell that is not settling, should be examined promptly. That is uncommon and usually turns out to be benign.
Why is my nose blocked but not when I exercise?
Exercise releases adrenaline, which shrinks the lining of the nose. Almost everyone breathes more easily through the nose during exertion. If yours gets worse with exercise instead, that suggests nasal valve collapse.
Can stress or anxiety block your nose?
Indirectly. The nasal lining is under autonomic control, so it responds to a range of physiological states. It is not usually the whole story in someone blocked for years.
Does a deviated septum get worse with age?
The deviation itself does not progress much. What changes is the surrounding lining, and the nose tends to droop slightly over the decades, both of which can make a long-standing deviation start to feel worse in your forties and fifties.
Will surgery definitely fix it?
For a clear structural cause, most people get a substantial improvement. Nobody should promise you a perfect nose, and if there is an allergic component it will still need treating afterwards.
Do I need a scan?
Only if polyps or sinus disease are suspected. A straightforward septal deviation does not need a CT to diagnose.
If you have been blocked for years and nobody has ever looked properly, that is worth changing. You can book a consultation and I will examine your nose with a camera, before and after decongestion, and tell you plainly which of the seven causes above is yours.
Mr David Whitehead is a Consultant ENT and Facial Plastic Surgeon in London, on the GMC Specialist Register for Otolaryngology and certified by the Royal College of Surgeons Intercollegiate Board in Cosmetic Surgery. More about my training and credentials.