Is your child's blocked nose sinusitis?

Published on 16 June 2026

A child’s blocked or runny nose may seem routine at first. Duration, severity and triggers can help decide when to seek medical advice.

At a glance

• Symptoms lasting ten days or more may need medical review.
• Facial or nasal pain, fever, lethargy or poor oral intake can suggest your child needs closer care.
• Treatment depends on the cause, from watchful waiting and nasal washes to antibiotics or specialist review.

When your child has a blocked nose, everyday routines are affected. Sleep becomes interrupted, meals take longer, and school or childcare plans may be disrupted.

A short cold usually resolves on its own. However, sinusitis becomes more likely when the blocked nose lasts longer than expected, worsens after short bouts of improvement, or keeps returning.

Cold-like symptoms can hide sinus inflammation

Sinusitis happens when the small air spaces in your child’s face become inflamed and mucus does not drain as usual. The result can feel like a stubborn cold, especially in the early days.

Beyond a blocked or runny nose, look out for signs of sinus involvement: facial pain or pressure, reduced smell or taste, headache, a cough that worsens at night, bad breath or toothache.

The colour of mucus can change during a respiratory infection, but a more useful clue is how your child is coping day to day. Pay attention when congestion affects sleep, appetite, energy, school attendance or physical comfort, especially when symptoms keep dragging on.

Symptoms beyond ten days need closer attention

You can start by noting the day symptoms began, whether a fever appeared, if symptoms improved, and subsequently worsened. Dr Aoyama explained that children may have acute, chronic, or recurrent sinusitis.

Acute sinusitis resolves in less than 30 days, while symptoms of chronic sinusitis last more than four weeks and sometimes up to 12 weeks or more. On the other hand, symptoms may return more than three times a year with recurrent sinusitis.

Allergies, enlarged adenoids and smoke exposure

Some children are more prone to sinus problems because their noses and sinuses are developing, making them more prone to irritation or harder to drain. Adenoids, the lymphatic tissue behind the nose, are also more likely to be enlarged in children and become a reservoir for infection. 

Dr Aoyama also highlighted higher-risk factors such as variances in nasal or sinus anatomy, previous nasal injury or surgery, such as cleft lip or palate repair, nasal polyps, large tonsils, enlarged adenoids, exposure to second-hand smoke, allergies, cystic fibrosis and immune system disorders.

Common allergies, such as sensitivity to dust mites, can also trigger symptoms like nasal congestion, frequent sneezing and itching, particularly when these symptoms occur or worsen at home. 

Viral, bacterial and allergy-related sinusitis require different care

A medical assessment helps identify whether symptoms are more likely linked to a viral infection, bacterial sinusitis, allergy, nasal anatomy or another underlying condition.

In acute cases caused by viral infections, watchful waiting may be enough while the immune system clears the infection. Depending on the cause and severity, treatment may include nasal washes, antibiotics for bacterial sinusitis or surgery in more severe or complicated cases.

Nasal washes and sprays should be used correctly

Once the likely cause is clearer, nasal care may be part of the treatment plan.  help clear mucus and ease congestion.

While sinus irrigation flushes the nose and sinus cavities to clear excess mucus and irritants, it should be used according to healthcare guidance, especially for younger children or children with ongoing symptoms. 

Medicated decongestant sprays, such as the oxymetazoline nasal spray, should be used only for short periods of up to five to seven consecutive days. There should also be a treatment-free period before repeated use to reduce the risk of rebound nasal congestion. 

For children with ongoing symptoms, it is best to seek medical advice on suitable options. The right plan may involve saline care, allergy treatment, antibiotics, short-term decongestant use or specialist review.

Benefits of a detailed symptom history

Before a visit to the doctor, parents should note how long the blocked nose has lasted, whether a fever is present, symptoms improved then worsened. They should also look out for any facial pain, poor sleep, appetite or reduced activity.

History of allergies, second-hand smoke exposure, previous nasal injury or surgery, repeated episodes and chronic medical conditions are also helpful information.

A child with dust mite allergies and persistent congestion may require a different treatment approach from a child with high fever, facial pain and worsening symptoms after a recent viral illness. Clearer details help the physician to decide whether supportive care, allergy treatment, antibiotics, nasal care or specialist review is needed.

When a blocked nose keeps recurring, beyond clearing the congestion, it’s more vital to understand what is driving the cycle — be it an infection, allergy reaction, smoke exposure, enlarged adenoids or other factors. With the right cause identified, treatment can move from repeated short-term management to more targeted care for your child.

In consultation with Dr Rie Aoyama, Consultant, Division of Paediatric Infectious Diseases, Department of Paediatrics, KTP-NUCMI, NUH.