What Is the Reason for a Blocked Nose? Causes, Symptoms & Treatment

What Is the Reason for a Blocked Nose? Causes, Symptoms & Treatment

04 July 2026

Nose block may seem like a straightforward issue at first glance. Most people think that it's going to clear up on its own, that it is a cold that will pass, and they wait for it to pass. The problem begins when it doesn't go away. If the nose keeps getting clogged week after week, the sinus cavities become clogged as well, causing sinusitis, sinus headaches, face pain, mouth breathing and exhausting you by the morning.

If you have ever wondered "why is my nose always blocked" - not when I have a cold, not for a week or two - but always - then it's most likely one of a few simple, well-known reasons. It's the ability to get to the right one that's the key to managing symptoms forever or fixing the problem.

The main Blocked Nose Causes refers to the most frequent causes of blocked noses.

The initial question of the ENT specialist is whether the nasal obstruction is caused by a structure or inflammation (or both). Just one of those differences alters the whole treatment trajectory.

When a person's nose is blocked, it is generally caused by one of two things: a narrowing of the nasal passages or swelling of the tissues in the nasal passages. It can make many patients feel like their nose is blocked all the time, even if the allergy medication only partially works, which is why many people suffer from two of these at the same time.

Deviated Nasal Septum

The nasal septum is the wall of cartilage and bone that divides the nose into two halves. When it leans significantly to one side – whether from birth or following an injury – it narrows the airway on that side, making nasal breathing harder.

In adults, a deviated nasal septum is the most common structural cause of nasal obstruction. Most patients expect it to block only the side the septum has shifted toward, which is true. What many do not realise is that the opposite nostril can become blocked too. When the septum deviates to one side, the inferior turbinate on the other side gradually enlarges to fill the extra space – a process called compensatory hypertrophy. The result is that one nostril is obstructed by the deviated septum itself, and the other is obstructed by the enlarged turbinate. Both sides end up blocked, but through two entirely different mechanisms.

This distinction matters in practice. Treating only the allergy component, or addressing only one side, will not fully restore nasal breathing. Both problems need to be identified and treated together.

Adenoid Hypertrophy (In Children)

Adenoid hypertrophy (enlarged adenoid tissue behind the nose) is the most significant structural blocked nose disorder to consider in kids. These enlarged adenoids are blocking both nostrils at the same time and cause a prolonged nasal congestion that never seems to get better between colds.

Children with adenoid hypertrophy often breathe through their mouths, snore at night and can over time develop ear problems since the adenoids are located near the openings in the Eustachian tubes. If your child has had “always been congested” since early childhood and ear infections along with it, then it should be evaluated.

Inferior Turbinate Hypertrophy

The inferior turbinates are bone with soft tissue covering that are located inside the nose. They warm and purify the air that you breathe. As they grow larger to the sides they greatly constrict the nasal passages.

One of the most frequent causes of nose blockage in clinical practice is inferior turbinate hypertrophy, and there are more than one etiology. It can happen due to the deviated nasal septum on the other side (as mentioned above), allergic rhinitis and non-allergic rhinitis (also known as vasomotor rhinitis). The enlargement may be bony or soft tissue and mucosal; the difference between these is important as they will respond differently to treatment.

This is a booklet for allergies, seasonal and year round.

Allergic rhinitis is one of the most common causes of blocked nose in urban India and is frequently underdiagnosed as patients think that their nose becomes blocked due to air pollution/wet weather and not a particular allergy.

During an allergic attack, the nasal lining becomes inflamed when an allergen (dust, pollen, mould spores, pet dander) reaches it, resulting in a blocked and congested nose, frequent sneezing, a running nose, watery eyes, itching of the eyes and sometimes a dry cough. Sometimes allergies are seasonal - when they are worse during a particular time of the year - or they are perennial - present 365 days a year. It is easy to miss that one has an allergy when there is no seasonal pattern, such as in the case of perennial allergies.

Nasal Polyps

Nasal polyps are small masses of tissue that have grown in the lining of your nasal passages or sinuses, which are not cancerous. They usually are seen in adults. The main cause is allergy: chronic inflammation of the nasal and sinus mucosa results in these outgrowths that can enlarge to the point of blocking the sinus drainage channels and the nasal passages.

If the sinus drainage is blocked, the mucus builds up in the sinus cavities and the usual symptoms of nasal polyps occur: continual nasal blockage, diminished or complete lack of sense of smell, facial pressure and a cold which never goes away. Polyps may involve more than one sinus and both sides of the nose.

What Causes One Side of Your Nose to be Congested All the Time?

If nasal obstruction is one-sided the list of possible causes for a blocked nose becomes a little shorter. The most common cause is a deviated nasal septum (the blockage is on the side the septum has moved towards).

In adults, however, one-sided obstruction may be due to a growth known as an antrochoanal polyp. A polyp that starts in the sinus behind the cheekbone (maxillary sinus) and increases through a hole into the nose obstructing one of the nostrils. An antrochoanal polyp is usually unilateral, while the bilateral type is seen in general allergic rhinitis.

Another possible cause of one sided nasal blockage is a growth or mass in the nasal cavity. Any adult with chronic unilateral nasal obstruction (especially in conjunction with nosebleeds, facial swelling, or worsening obstruction over time) should get an immediate evaluation from an ENT specialist. The vast majority of cases are benign, but if it is obstructed on one side without resolution it needs proper investigations.

The Confusion - Blocked Nose Without Cold!

If one is having difficulty breathing through the nose, most people think of a viral cold. Many patients think that if the nose is congested and there is no fever or sore throat or other evidence of infection, then it's just a cold or a cold coming on. Weeks pass. Nothing changes.

Almost all nose blockage without a cold is caused by one of the above structural or inflammatory conditions, including deviated septum, turbinate hypertrophy, allergic or non-allergic rhinitis, or nasal polyp. These are all those without a virus. None of them will heal with the passage of a cold.

There are also factors affecting the environment that can be underestimated and that act as a contributing factor. Even low humidity in the room, air conditioning, exhaust fumes, smoke, and work exposures to dust and chemical irritants, all irritate the lining of the nose, and cause congestion that is indistinguishable from nasal congestion associated with colds. In heavily polluted urban areas, nasal irritation from long-term exposure to air pollution is common, even in the absence of an infection.

Nasal congestion also can be caused by hormonal shifts. Pregnancy rhinitis is a condition which is well recognised, in which nasal congestion is experienced during pregnancy, but without other clinical features. In some people, swelling in the nose is also due to a thyroid disorder. If the nose began to block at some time around a hormonal shift and has not calmed down, then that relation should be explored.

Another explanation, that does not always lead to diagnosis, is non-allergic or vasomotor rhinitis. In vasomotor rhinitis the lining of the nose reacts to triggers such as cold air, strong smells, temperature and humidity changes, physical activity - but not to allergens. Allergy testing is normal, and this can leave the patient with no idea why they are still continuing to experience symptoms.

What chronic nasal congestion is and the effects of its duration over time.

Chronic nasal obstruction is usually considered to be nasal congestion lasting 12 weeks or more. The blockage of the nose for this period is not just limited to the nose.

The first thing that is affected is sleeping. Because of blocked nasal passages, the person breathes through their mouth at night, exacerbating snoring and causing OSA in some people. This poor sleep can add up to feelings of fatigue, difficulty focusing and low mood in the day. These symptoms are often mistaken for stress or fatigue, instead of a problem with breathing that is having an impact on patient's sleep each night.

Chronic nasal congestion also hinders the sense of smell. A significant portion of our sense of taste is through our sense of smell, so if the nose is blocked, the enjoyment of the food diminishes. This may occur so slowly that the patient is amazed to find that when the breathing through the nose returns so do the flavours that they had not noticed were fading.

The nose drains into the sinuses and middle ears via small passages. If the passages remain obstructed due to chronic nasal congestion, there is an increased risk of other complications, such as recurrent sinusitis and middle ear infection. If a child has repeated ear infections and/or a chronic nasal blockage, adenoid hypertrophy should be suspected unless ruled out.

The heavy feeling and facial pressure of congestion also often get confused with tension headaches and these patients may be taking pain medication for several months without relief from nasal and sinus congestion.

Clear a blocked nose with these simple home remedies.

Certain treatments actually work to relieve nasal congestion, especially if it is caused by allergic rhinitis or minor sinusitis.

The most evidence-based home treatment is saline nasal irrigation. A saline solution washes out the mucus and allergens from the nasal passages, simply through the use of a saline rinse bottle or neti pot. Rinsing with regular saline, done once or twice a day, helps to clear nasal congestion in individuals who suffer from allergic rhinitis and chronic sinusitis and does not cause any side effects. This should be done on a regular basis, not just when it's an acute episode.

Inhaling steam will help loosen thickened mucus and give temporary relief. It doesn't cure, but it can help ease the discomfort for several hours.

Having the head of the bed raised slightly when lying down helps to decrease blood congestion in the nasal passages and can help alleviate congestion at night. Any elevation is welcome, even if it's only modest.

If the cause of congestion is allergic or irritant rhinitis, avoiding known triggers - such as particular allergens, smoke, dry air, chemical exposures - will decrease the frequency and severity of congestion.

The first step to knowing how to unclog a blocked nose at home is to understand what to avoid. Nasal sprays containing oxymetazoline (the same drug used in decongestant nasal sprays) work quickly, but should not be used more than 3 to 5 days in a row. Rebound Congestion occurs when the spray is used longer, and the nose gets worse when it is stopped than when it was used. This is known as rhinitis medicamentosa, and is a very common problem in ENT clinics, and is entirely due to overusing the short term decongestant sprays.

Treatment for nose blockage – Clinical Options.

The first step in treatment for nose blockage is to determine the cause. A deviated septum requires a different type of treatment than allergic rhinitis, and nasal polyps require a completely different type of treatment than vasomotor rhinitis, so a correct diagnosis is necessary for this type of treatment to have any measurable success.

Nasal Corticosteroid Sprays

For allergic rhinitis and turbinate hypertrophy with an inflammatory component, nasal corticosteroid sprays are the mainstay of nose blockage treatment. If they are used regularly they will help decrease the swelling of the nasal lining within a few weeks. They do not pose a risk for long-term use and are much more effective than antihistamines alone for nasal obstruction.

Allergy Management

If allergen testing indicates that particular allergens are to blame, then avoiding them helps to lessen the number of episodes. When allergies are severe or numerous, allergy shots (immunotherapy) and sublingual drops can help lessen the immune reaction over time and offer more long-term control than a medication.

Turbinate Reduction

If the blockage is caused by inferior turbinate hypertrophy and medications don't work well, there are a few minimally-invasive procedures available that can reduce the size of the turbinates – radiofrequency reduction, coblation or surgical turbinoplasty. Local or general anaesthetic can be used for these, depending on the amount of work required.

Septoplasty

Septoplasty is a surgical procedure to correct a deviated septum. It is performed completely through the nose, with no visible marks, and a patient is usually back to normal activity within 1-2 weeks following the procedure under general anaesthetic. One of the most frequently performed ENT surgeries. It can provide long-term relief of nasal congestion in patients with true structural nasal blockage who cannot be treated medically.

Functional Endoscopic Sinus Surgery (FESS)

If antibiotics do not work for chronic sinusitis or if the nasal polyps are large, functional endoscopic sinus surgery (FESS) may be necessary to open the blocked sinus drainage passages with the assistance of a camera and instruments inserted through the nostrils. No additional skin cuts are needed. The procedure restores sinus ventilation and drainage, decreases the occurrence of sinus infections and, if polyps are removed, usually returns the sense of smell.

Adenoidectomy

Children who have adenoids as a cause of chronic nasal congestion, repeated ear infections or persistent snoring will see immediate and consistent improvement after surgery to remove the adenoids. It is a standard ear and throat surgery, and has a good safety profile in children with a short recovery period.

When to See an ENT Specialist

Home measures and over-the-counter medication are good initial steps. However, there are instances when a timely ENT evaluation is called for, rather than postponed:

Nasal congestion of more than 3 months with no identifiable cause. Constipation regularly on one side only. Unusual nosebleeds that do not have a known cause. Persistent or recurring facial pain or pressure. A more than two-week loss of smell. A child who always has an ear infection, keeps his or her mouth open and snores or who has more than one ear infection in a year.

A specialist ENT doctor can perform an examination of the inside of the nose using a nasal endoscope in the clinic and be able to identify structural issues, arrange for allergy testing if appropriate, and create a treatment plan based on the actual cause of the blockage (as opposed to just the symptoms).

If your nose is always stuffed up, it's not a fact of life. In the majority of instances, the treatment is effective and the cause is known. The first step is to determine what blocked nose cause is applicable to you.