How do I know if my child has sinusitis or just a cold?

If cold symptoms (runny nose, congestion, cough) persist for more than 10 days without improvement, or if there is a sudden worsening after initial improvement (high fever + purulent discharge), bacterial sinusitis is strongly suspected. A common cold improves progressively within 7-10 days.

Does childhood sinusitis always need antibiotics?

No. Most sinusitis cases in children are viral and resolve on their own in 7-10 days. Antibiotics are only indicated when bacterial sinusitis is strongly suspected: symptoms lasting more than 10 days, worsening after initial improvement, or high fever with purulent discharge for 3+ consecutive days.

Can babies get sinusitis?

Yes, but it is less common in babies. The paranasal sinuses develop gradually: the ethmoid and maxillary sinuses exist from birth, but the frontal sinuses only develop after age 5-7. Therefore, frontal sinusitis does not occur in young children.

Does nasal irrigation help with childhood sinusitis?

Yes, very much! Saline nasal irrigation is the most important treatment for sinusitis, both viral and bacterial. It removes secretions, improves sinus drainage, and relieves congestion. It should be done 3-4 times daily during the acute episode.

Can sinusitis in children become something more serious?

Rarely, but yes. Complications such as orbital cellulitis (infection around the eye) and meningitis can occur. Seek emergency care if there is swelling or redness around the eyes, severe headache, very high fever, or behavioral changes.

Do children with allergic rhinitis get sinusitis more often?

Yes. Allergic rhinitis causes chronic inflammation of the nasal mucosa, obstructs sinus drainage, and predisposes to recurrent sinusitis. Treating rhinitis (with nasal irrigation and medication) is essential to prevent recurrent sinusitis.

Childhood Sinusitis: Symptoms, Treatment, and Prevention

Has your child had a stuffy nose for more than 10 days that won't improve? It could be sinusitis. Childhood sinusitis is the most common complication of the common cold — between 5% and 13% of upper respiratory infections in children progress to bacterial sinusitis. In this guide, I explain how to identify it, when antibiotics are needed, and the essential role of nasal irrigation. For expat families in São Paulo, knowing how to distinguish sinusitis from a lingering cold can save unnecessary trips to the ER.

What Is Sinusitis?

The sinuses are air-filled cavities located around the nose and eyes. In healthy children, these cavities drain freely into the nasal passages. When a cold or flu inflames the nasal lining, the sinus openings become blocked, mucus accumulates, and bacteria can multiply — causing sinusitis.

Key Facts About Childhood Sinusitis

5-13%

of colds become bacterial sinusitis

10 days

the key threshold: cold symptoms without improvement

6-8

colds per year are normal for children

How to Tell If It Is Sinusitis

The tricky part: sinusitis starts out looking exactly like a regular cold. The key is recognizing when a cold has crossed the line into sinusitis. There are three classic patterns:

Pattern 1: Persistent Symptoms (>10 days)

Cold symptoms (congestion, runny nose, cough) that persist for more than 10 days without any improvement. This is the most common presentation in children.

Pattern 2: Worsening After Improvement

The child was getting better from a cold, then suddenly worsens: new fever, increased nasal discharge, or worsening cough after 5-7 days of initial improvement.

Pattern 3: Severe Onset

High fever (above 39 C / 102 F) and purulent (thick, colored) nasal discharge for 3 or more consecutive days right from the start of the illness.

Sinusitis Symptoms in Children

In Young Children (Under 5)

Persistent nasal congestion

Thick colored nasal discharge (yellow/green)

Cough that worsens when lying down

Mouth breathing and snoring

Low-grade fever

Bad breath (halitosis)

Swelling around the eyes (morning)

In Older Children (Over 5)

All of the above, plus:

Headache or facial pressure/pain

Pain worsens when leaning forward

Post-nasal drip (mucus down the throat)

Reduced sense of smell

Ear fullness or pressure

Fatigue and general malaise

Is your child's cold lasting too long?

Dr. Paula can evaluate whether it's sinusitis and recommend the right treatment. Consultations available in English in Itaim Bibi.

Talk to the Pediatrician

Treatment of Childhood Sinusitis

1. Nasal Irrigation: The Most Important Treatment

Saline nasal irrigation is the cornerstone of sinusitis treatment — for both viral and bacterial cases. It removes accumulated mucus, unblocks the sinus openings, and relieves congestion.

How to Perform Nasal Irrigation

Use 0.9% saline solution (available at any pharmacy in Brazil)
For babies: use a syringe (without needle) with 3-5 mL per nostril
For older children: use a squeeze bottle with 10-20 mL per nostril
Perform 3-4 times daily during acute episodes
Tilt the child's head slightly forward — never backward

2. When Are Antibiotics Needed?

Antibiotics are only indicated for bacterial sinusitis. The pediatrician will consider antibiotics when:

→Symptoms persist for more than 10 days without improvement
→There is a worsening after initial improvement (new fever + purulent discharge)
→Severe onset: high fever + purulent discharge for 3+ consecutive days

Amoxicillin is the first-line antibiotic for childhood sinusitis, typically prescribed for 10 to 14 days. It is important to complete the full course even if symptoms improve quickly.

The Connection Between Allergic Rhinitis and Sinusitis

Children with allergic rhinitis are significantly more prone to recurrent sinusitis. The chronic nasal inflammation from allergies obstructs sinus drainage, creating a breeding ground for bacteria. Treating the underlying allergy — with nasal corticosteroid sprays and environmental control — is essential for preventing repeated sinus infections.

Similarly, sinusitis is a common cause of chronic cough in children. If your child has a persistent productive cough that worsens upon waking, sinusitis should be considered as a possible cause.

Red Flags: When to Seek Emergency Care

Go to the Emergency Room If:

Swelling or redness around the eyes — may indicate orbital cellulitis, a serious complication
Severe headache that does not respond to regular pain relief
Very high fever (above 39.5 C / 103 F) with altered behavior
Changes in vision or eye movement

How to Prevent Sinusitis

Regular nasal irrigation

Daily saline rinse during cold and allergy season keeps sinuses clear

Treat allergies proactively

Managing allergic rhinitis prevents the cycle of inflammation and infection

Keep vaccinations current

Flu and pneumococcal vaccines reduce respiratory infections

Frequent handwashing

The best defense against the colds that lead to sinusitis

Humidify the home appropriately

Especially during Sao Paulo's dry autumn/winter season

Avoid cigarette smoke

Smoke irritates the nasal lining and impairs sinus drainage

Tip for Expat Families

Saline solution (“soro fisiológico”) is readily available at any pharmacy in Brazil and is very affordable. You can buy it in small single-use vials or in larger bottles. Ask your pediatrician about the best nasal irrigation technique for your child's age. If your child has recurrent sinusitis, a telemedicine follow-up can be a convenient option for ongoing management.