Coughing in Children — When Is It Normal and When Should You Worry

Cough — A defence mechanism of the body

Cough is an essential protective reflex of the airways. Its role is to eliminate secretions, irritating particles, microorganisms, and foreign bodies from the trachea, bronchi, and larynx. In children, cough is one of the most common symptoms for which parents seek medical consultation.

It is important to understand that cough is not a disease in itself, but a symptom. Effective treatment involves identifying and addressing the cause, not merely suppressing the cough.

Types of cough and what they tell us about the cause

Dry cough (non-productive)

This is a cough without expectoration, irritating, that causes discomfort. It frequently occurs in:

• The onset of viral respiratory infections
• Allergic rhinitis (cough is caused by postnasal drip)
• Acute laryngitis
• Gastro-oesophageal reflux
• Exposure to irritants (smoke, dust, cold air)

Productive cough (wet)

This is accompanied by expectoration (mucus). It usually indicates the presence of secretions in the airways:

• Acute or chronic bronchitis
• Sinusitis — purulent secretions drain from the sinuses down the posterior pharyngeal wall
• Resolution phase of the common cold
• Adenoid vegetations — secretions stagnate in the nasopharynx and cause cough, especially nocturnal

Barking cough (croup)

This is a cough with a deep, harsh tone that resembles the barking of a dog or the sound of a seal. It is characteristic of laryngotracheitis (croup), a viral infection of the larynx that affects children between 6 months and 3 years. It is associated with inspiratory stridor (harsh sound on inspiration) and hoarse voice.

Nocturnal cough

Cough that occurs predominantly at night or worsens in the supine position has some specific causes:

• Postnasal drip — secretions from the nose drain down the posterior pharyngeal wall when the child lies down
• Gastro-oesophageal reflux — gastric acid irritates the larynx and trachea
• Bronchial asthma — nocturnal cough may be the first sign

ENT causes of cough in children

Many causes of cough in children have an ENT (otorhinolaryngological) origin. The most common are:

Postnasal drip

This is probably the most common cause of chronic cough in children. Secretions from the nose and sinuses drain down the posterior pharyngeal wall, irritating the mucosa and triggering the cough reflex. It can be caused by nasal obstruction, sinusitis, allergic rhinitis, or adenoid vegetations.

Acute laryngitis

Inflammation of the larynx, usually viral, causes dry cough, hoarse voice, and sometimes stridor. In young children, it can progress to croup. It usually resolves in 3-7 days.

Adenoids (adenoid vegetations)

Hypertrophic adenoid vegetations can cause chronic cough by obstructing nasal drainage and maintaining a focus of infection in the nasopharynx. The cough is usually productive and predominantly nocturnal.

Tonsillitis

Recurrent tonsillitis can cause cough, mainly through pharyngeal irritation by purulent secretions.

When is cough normal

A healthy child may cough occasionally (up to 10 episodes per day), especially in the morning. Additionally, cough in the context of a cold is normal and may persist for 2-3 weeks after the initial infection, as the airways recover. This post-infectious cough usually does not require specific treatment.

Warning signs — When you should be concerned

Seek medical attention immediately if the cough is accompanied by:

• Breathing difficulties — rapid breathing, intercostal retractions (skin pulling between the ribs), cyanosis (bluish colouration of the lips)
• Severe stridor — harsh sound on inspiration, especially at rest
• Sudden onset of severe cough — especially in a young child who was playing with small objects (suspicion of a foreign body in the airways)
• Persistent high fever (above 39 degrees) associated with productive cough
• Haemoptysis — presence of blood in the sputum

Consult an ENT specialist if the cough:

• Lasts more than 3-4 weeks (chronic cough)
• Is predominantly nocturnal and associated with snoring or mouth breathing
• Is associated with persistent hoarseness (over 2 weeks)
• Occurs in the context of recurrent ENT infections
• Does not respond to conventional treatments

What you can do at home

• Ensure adequate hydration — warm liquids (tea, soup) soothe pharyngeal irritation
• Perform regular nasal hygiene — reduces postnasal drip and associated cough
• Humidify the air — especially during the cold season
• Elevate the head of the bed — reduces postnasal drip and reflux
• Avoid cigarette smoke and other irritants in the child's environment
• Honey (in children over 1 year) — studies show that a teaspoon of honey before bedtime can soothe nocturnal cough as effectively as some cough syrups

Do not administer antitussive syrups (which suppress cough) to children under 6 years of age without medical recommendation. Productive cough has a protective role and suppressing it can be harmful. Always consult a doctor before administering any medication to your child.

Conclusion

Cough in children is in most cases a symptom of a benign and transient condition. Identifying the type of cough and the underlying cause is essential for effective treatment. Many causes of chronic cough in children are ENT-related and respond well to treatment when correctly diagnosed.