Your cold has gone, but your blocked nose has not. Perhaps you are still dealing with thick mucus, pressure around the face, or a sense of smell that never quite returned.

It is common for a viral cold to cause temporary nasal congestion and sinus discomfort. However, when these symptoms continue for weeks or months, repeatedly return, or never completely clear, there may be more going on than an ordinary cold.

One possible cause is chronic sinusitis. Recognising the pattern of symptoms can help you know when it may be worth having your nose and sinuses properly assessed.

The sinuses are air-filled spaces within the bones around the nose and face. They are lined with tissue that produces mucus, which normally drains into the nose.

Sinusitis occurs when the lining of the nose and sinuses becomes swollen and inflamed. When this swelling persists, normal mucus drainage may be affected, and symptoms such as nasal blockage, discharge, and facial pressure can develop.

Chronic sinusitis, also known as chronic rhinosinusitis, refers to symptoms that persist for 12 weeks or longer.

Doctors do not diagnose the condition based on duration alone. The type of symptoms present and evidence of inflammation inside the nose or sinuses are also considered.

Some people with chronic sinusitis develop nasal polyps. These are soft, non-cancerous growths arising from inflamed tissue inside the nose or sinuses that may contribute to blockage and reduced smell.

A common cold is usually caused by a virus. Typical symptoms can include:

• A blocked or runny nose
• Sneezing
• Sore throat
• Cough
• General tiredness

The swelling caused by a cold can temporarily block the nose and make it harder to smell. However, symptoms generally improve as the viral illness settles.

Chronic sinusitis causes a much more persistent pattern.

Important symptoms doctors look for include:

• Nasal blockage or congestion
• Nasal discharge or mucus draining backwards into the throat
• Facial pain or pressure
• Reduced sense of smell

A person with chronic sinusitis typically has more than one relevant symptom over a prolonged period, together with evidence of inflammation found during an examination or scan.

It is also important not to confuse chronic sinusitis with an acute bacterial sinus infection.

For acute symptoms, a doctor may consider bacterial sinusitis when symptoms continue for at least 10 days without improvement, or when they improve initially and then become worse again. This does not mean sinusitis becomes chronic after 10 days.

No single symptom can confirm chronic sinusitis. The combination, persistence, and pattern of symptoms matter more.

A blocked nose is common during a cold. A nose that remains persistently congested long after the cold has gone deserves more attention.

With chronic sinusitis, ongoing inflammation can narrow the nasal passages and interfere with normal sinus drainage. Some people feel blocked on both sides, while others notice one side is consistently worse.

However, chronic sinusitis is not the only possible explanation. Allergic rhinitis, nasal polyps and structural problems such as a deviated nasal septum can also cause persistent obstruction.

This is why repeatedly treating a blocked nose without knowing the underlying cause may not solve the problem.

Persistent mucus is another common feature of sinus disease.

It may drain through the nostrils or travel backwards into the throat. This backward drainage is often called postnasal drip and may irritate the throat or contribute to coughing.

Do not rely on mucus colour alone to decide whether you have a bacterial infection. Yellow or green mucus can occur with different types of nasal and sinus inflammation and does not by itself prove that antibiotics are needed.

The duration of symptoms and other findings are more useful.

Many people notice that their sense of smell temporarily becomes weaker when they have a cold because the nose is swollen and congested.

With chronic sinusitis, the reduction in smell may continue for much longer. Persistent inflammation, swelling or nasal polyps can all contribute to a reduced sense of smell.

You may notice that perfume or familiar household smells seem faint, or that food does not seem as flavourful as before.

A persistent or significant change in smell is therefore worth mentioning when discussing long-term nasal symptoms with your doctor.

Chronic sinusitis may cause pressure, heaviness or discomfort around the cheeks, forehead, nose or between the eyes.

However, facial pain on its own does not necessarily mean you have sinusitis. Headache conditions, including migraine, can sometimes be mistaken for “sinus headaches”.

Facial pressure becomes more meaningful when it occurs alongside other persistent nasal symptoms such as congestion, nasal drainage or reduced smell.

If headache or facial pain is the main symptom and there are few nasal symptoms, another cause may need to be considered.

Long-term symptoms can gradually become your new normal.

You may become used to breathing through a congested nose, dealing with mucus at the back of the throat or struggling to smell properly. Some people with chronic sinusitis also report tiredness, and persistent symptoms can affect day-to-day quality of life.

At this stage, the important question is no longer simply, “Do I have a cold?” It is whether there is an ongoing nasal or sinus condition that needs to be identified.

Chronic sinusitis involves persistent inflammation of the nose and sinuses and may have several contributing factors.

Long-term swelling can affect normal mucus drainage and make symptoms difficult to settle completely.

Possible contributing factors include:

• Ongoing inflammation of the nose and sinus lining
• Nasal polyps
• Allergic rhinitis occurring alongside sinus disease
• Structural narrowing within the nose
• Asthma and certain other associated conditions

Allergic rhinitis is particularly relevant because it can cause congestion and nasal discharge that may be mistaken for sinusitis.

A person can also have allergic rhinitis and chronic sinusitis at the same time. For people in Singapore with frequent or year-round nasal symptoms, it may therefore be helpful to distinguish allergies from chronic sinusitis because the symptoms can overlap.

You do not need an ENT assessment every time you have a cold or temporarily blocked nose.

Medical assessment becomes more useful when symptoms are persistent, troublesome or difficult to explain.

Consider speaking to a doctor if you have:

• Long-lasting nasal congestion or discharge
• A persistent reduction in your sense of smell
• Repeated episodes of troublesome sinus symptoms
• Nasal obstruction that affects comfortable breathing
• Symptoms that continue despite appropriate initial treatment
• Possible nasal polyps
• Uncertainty about whether you have sinusitis, allergies or another nasal condition

Symptoms continuing for around three months are particularly important when assessing possible chronic sinusitis.

Serious complications from sinusitis are uncommon. However, the sinuses are located close to the eyes and other important structures.

Seek prompt medical attention if sinus symptoms occur together with:

• Swelling around the eye
• Double vision or reduced vision
• Severe or rapidly worsening headache
• New confusion or other unusual neurological symptoms
• Significant swelling around the forehead
• Severe or rapidly worsening illness

These symptoms should not simply be treated as part of a lingering cold.

A diagnosis cannot be made simply because someone has had a blocked nose for several months.

Doctors consider the pattern of symptoms and look for evidence of inflammation inside the nose or sinuses.

Your doctor may ask when the symptoms began, whether they ever completely disappear, and which symptoms affect you most.

Relevant information may include:

• Nasal blockage
• Nasal discharge or postnasal drip
• Changes in smell
• Facial pressure
• Previous sinus problems
• Allergies
• Asthma
• Treatments already tried

This can also help identify other conditions that may be causing similar symptoms.

An ENT doctor may perform a nasal endoscopy.

This involves gently passing a thin instrument with a small camera into the nose. It allows areas deeper inside the nasal passages to be examined and may reveal swelling, mucus, nasal polyps or other abnormalities.

The examination can provide information that is not always available simply by looking into the front of the nose.

A CT scan produces detailed images of the sinuses and their drainage pathways.

It can help show inflammation, identify which sinuses are affected, and reveal structural features that may be relevant to treatment.

However, having nasal congestion does not automatically mean you need a CT scan. Whether imaging is appropriate depends on the symptoms, examination findings and individual situation.

Treatment is tailored to the individual rather than using one approach for everyone.

The aims are generally to reduce inflammation, improve mucus clearance, relieve symptoms and manage any factors contributing to the condition.

Saline nasal irrigation is commonly used to rinse mucus and irritants from the nasal passages.

Corticosteroid nasal sprays can also help reduce inflammation in chronic sinusitis. They generally need to be used correctly and consistently rather than only on days when the nose feels especially blocked.

Where allergies or other related conditions are contributing to symptoms, these may also need appropriate management.

Antibiotics are not routinely recommended simply because someone has chronic sinusitis. They may be appropriate in selected situations, such as when there is an acute bacterial flare-up, but the decision should be based on clinical assessment.

Surgery is not automatically required when someone is diagnosed with chronic sinusitis.

An ENT surgeon considers factors such as the severity of symptoms, the type and extent of sinus disease, the impact on daily life and the response to previous treatment.

Surgery may be considered when an ENT specialist believes it is likely to provide more benefit than continued medical treatment alone. Some people with nasal polyps or significant sinus obstruction may also be suitable candidates.

One commonly performed procedure is functional endoscopic sinus surgery, often shortened to FESS.

FESS is usually performed through the nostrils using a small camera and specialised instruments, without external facial incisions. The aim is to improve access and drainage through the affected sinus pathways where appropriate.

Treatment decisions should be individualised. There is no single fixed course of medication that every patient must complete before surgery can be considered.

A cold can make your nose blocked, runny and uncomfortable, but it should not become an explanation for nasal symptoms that continue month after month.

Persistent nasal blockage, ongoing drainage, reduced smell and facial pressure are among the signs that may point towards chronic sinusitis, particularly when several occur together over a prolonged period.

That does not mean every long-lasting blocked nose is chronic sinusitis. Allergies, nasal polyps, structural narrowing and other nasal conditions can produce similar symptoms.

The important step is identifying the actual cause. If what seemed like an ordinary cold never fully disappeared, or your nasal symptoms keep returning and interfering with daily life, a proper medical assessment can help clarify what is happening and guide appropriate treatment.

1. Can Chronic Sinusitis Cause a Persistent Cough?
Chronic sinusitis can contribute to coughing when mucus drains down the back of the throat.
However, a persistent cough can have many other causes and should not automatically be attributed to the sinuses. If coughing continues, particularly when nasal symptoms are mild or absent, further medical assessment may be appropriate.

2. Can Chronic Sinusitis Go Away on Its Own?
Symptoms may fluctuate, and some people experience periods when they feel better.
However, persistent chronic sinusitis may require appropriate management to control inflammation and address contributing factors. If nasal symptoms have continued for months, it is sensible to have the cause assessed rather than simply waiting for them to disappear.

3. Is Chronic Sinusitis Always Caused by a Bacterial Infection?
No. Chronic sinusitis involves persistent inflammation of the nose and sinuses and should not simply be viewed as a long-lasting bacterial infection.
This is one reason antibiotics are not routinely recommended for everyone with chronic sinusitis. They may be appropriate in particular situations, but treatment should be based on clinical assessment.

4. Can Allergies and Chronic Sinusitis Occur Together?
Yes. Allergic rhinitis and chronic sinusitis are different conditions, but a person may have both.
Because symptoms such as nasal blockage and discharge overlap, an assessment may be needed to determine which condition is contributing to the problem and how each should be managed.

5. Does Having Chronic Sinusitis Mean I Will Need Surgery?
No. Many people are managed with non-surgical treatments such as saline nasal irrigation, nasal corticosteroid sprays, and treatment of contributing conditions.
Surgery may be considered when symptoms remain troublesome despite appropriate treatment, or when problems such as nasal polyps or significant sinus obstruction are present. The decision should be made individually after an ENT assessment.