Cough in Children: Dry, Wet, Barking and Without Fever

Cough is the commonest reason a child is brought to a paediatrician and, at the same time, the symptom that attracts the most unnecessary prescriptions. What helps is not hunting for a stronger syrup but three distinctions: the character of the cough, how long it has lasted, and what breathing looks like.

Dry and wet cough in children: what the difference changes

This is the first thing that sets management.

The practical conclusion: cough-suppressing drugs are used rarely, only for a distressing dry cough, and only on a doctor's instruction. In wet cough they are contraindicated.

Barking cough in children: croup and when it is urgent

A child falls asleep normally and wakes in the night with a harsh barking cough, a hoarse voice and noisy breathing in. This is croup — swelling of the larynx below the vocal cords, usually viral, typical between 6 months and 3 years.

The key severity sign is stridor, a whistling noise on inspiration:

• stridor only when crying or upset — mild, usually managed at home with observation;
• stridor at rest — moderate or worse, a doctor is needed;
• stridor with chest in-drawing, pallor, agitation or lethargy — call an ambulance.

Home measures (cool moist air, keeping the child calm) reduce distress, but evidence that they change severity is weak; the main treatment for croup is prescribed by a doctor.

Cough without fever in children: common causes

The absence of fever shifts the search from acute infection to other mechanisms:

• Post-infectious cough — the commonest, covered below.
• Post-nasal drip in allergic or protracted rhinitis; the wider picture is in the allergy guide.
• Asthma and its equivalents: cough after running, laughing, in cold air, at night. Raised eosinophils and family atopy support it.
• Gastro-oesophageal reflux — cough after meals and when lying down.
• Foreign body — a sudden cough in a well child, often while eating or playing with small objects. This is urgent even if the episode passed.

Night cough in children

At night three mechanisms work at once: mucus drains backwards when lying down, the airways physiologically narrow, and vagal tone rises. So a night cough intensifies with almost any cause and by itself points to no specific diagnosis. What matters is the combination: with wheeze on expiration over weeks it is an asthma conversation, with nasal blockage a rhinitis one, with heartburn a reflux one.

Chronic cough in children: the four-week threshold

International guidelines draw the line at 4 weeks. Before that, cough after a viral illness is expected. Beyond it, the cough is chronic and needs an algorithm rather than another syrup.

A protracted wet cough deserves separate attention: a child coughing wet for more than four weeks may have protracted bacterial bronchitis, which is treated specifically rather than with expectorants. Chronic cough also prompts exclusion of whooping cough, which causes paroxysms to the point of vomiting and can last months, and tuberculosis, using the tests described in Mantoux and Diaskintest.

How to treat cough in children — and what not to use

Residual cough after a viral illness

After a viral infection the bronchial lining recovers over weeks and the cough reflex stays heightened. A cough without fever that gradually fades over 2–3 weeks is normal recovery, not undertreatment. What is concerning is the opposite: a cough that intensifies, returning fever, or new breathlessness. Which viruses are circulating and how their pictures differ is covered separately in which virus is going around.

If a child falls ill very often, the question is usually age and group care rather than immunodeficiency — see how to boost immunity. Some episodes are preventable by vaccination, whose schedule and logic are described in the vaccination calendar.

When a cough in children is dangerous and tests are needed

Seek urgent care for:

• breathlessness, rapid breathing, in-drawing between and below the ribs, nasal flaring;
• blue lips or the area around the mouth;
• stridor at rest, inability to speak or drink;
• a sudden coughing fit in a well child — suspected foreign body;
• coughing blood;
• in an infant under 3 months, any cough with fever, see fever in children;
• cough with a rash — see rash in children.

Tests are not needed for an ordinary cough in the first days. They become meaningful in a protracted course, suspected pneumonia or returning fever: a complete blood count with differential (paediatric ranges are in CBC in children), CRP to separate viral from bacterial inflammation, and where allergy is suspected, immunoglobulin E and the panel described in the allergy panel card. If the throat dominates the complaints, see tonsillitis.

This article is informational. Diagnosis and treatment are the paediatrician's task.