Some children seem to catch everything. Every cold turns into a chest infection, every chest infection needs antibiotics, and by the third or fourth round in a winter most parents start asking a reasonable question: is this just bad luck, or is something else going on? Usually, there is a reason — and it is usually treatable.
First, what counts as "recurrent"?
Almost every young child gets frequent coughs and colds. Pre-school children average six to eight viral respiratory infections a year, and children who have just started nursery often have more. That alone is not a red flag.
What concerns me is a different pattern. It is the child whose every cold goes to the chest. The child who needs antibiotics four or five times a winter. The child who never quite gets back to baseline between episodes, or who is losing weight, tiring easily, or falling behind at school because they are always unwell.
The thresholds I use in clinic are practical rather than absolute:
- More than one episode of pneumonia in a year, or two or more ever
- Three or more chest infections in a year requiring antibiotics
- Infections that keep occurring in the same area of the lung — this always needs explanation
- A wet or productive cough that never fully clears between episodes
- Poor weight gain or faltering growth alongside the infections
The causes I look for, in order of likelihood
1. Asthma that has not been recognised
This is by far the most common answer. Undiagnosed or undertreated asthma is repeatedly labelled as "another chest infection" because the child coughs, wheezes and sounds rattly. Each episode is treated with antibiotics, improves partly, and returns. The clue is that symptoms are worse at night and in the early morning, come on after exercise or laughter, or flare around dust, animals and smoke.
2. Protracted bacterial bronchitis
A low-grade bacterial infection that sits in the large airways. It is not severe enough to cause pneumonia but persists stubbornly, causing a wet, productive cough. These children typically get repeated short antibiotic courses that suppress the infection without clearing it. The treatment is a longer, targeted course — usually two to four weeks — and the response is often dramatic. Left untreated over years, it can progress to bronchiectasis, which is why I take it seriously.
3. Aspiration and swallowing difficulty
Some children, particularly infants and those with neurological or neuromuscular conditions, inhale small amounts of milk, food or saliva into the airway. Reflux can do the same. The clue is coughing or spluttering with feeds, a wet-sounding voice after drinking, or infections concentrated in the lower or right side of the lung.
4. Allergic rhinitis and chronic nasal disease
Persistent nasal inflammation produces mucus that drips down the back of the throat overnight. In Dubai, house dust mite allergy is extremely common because of air conditioning and sealed buildings. Children mouth-breathe, the airway dries, and secretions are cleared poorly.
5. Inhaled foreign body
A retained peanut, seed or small plastic fragment causes persistent infection beyond the blockage. The history of choking is often weeks or months old and may have been forgotten entirely. Any child with repeated infection in one fixed location needs this excluded.
6. Structural and genetic causes
Less common, but the ones I most want not to miss:
- Primary ciliary dyskinesia — the tiny hairs clearing the airway do not work. Look for a wet cough since the newborn period, persistent glue ear, and neonatal breathing difficulty in a term baby.
- Cystic fibrosis — usually picked up on newborn screening, but not everywhere, and not in every child who moved here from another country.
- Bronchiectasis — permanently widened, damaged airways that trap infection. Increasingly recognised in children and reversible in its early stages if treated.
- Immune deficiency — suggested by infections at multiple sites, not just the chest, or unusually severe or unusual organisms.
- Congenital airway or lung abnormalities — a compressing blood vessel, an airway narrowing, or a congenital lung lesion.
How I investigate
The aim is a precise answer, not another course of antibiotics. Depending on the history, I typically arrange:
- Chest X-ray — and I always want to see previous films, because a shadow that keeps returning in one place is the single most useful clue
- Spirometry and reversibility testing — achievable in most children from about five or six years
- FeNO — measuring airway inflammation, which helps confirm or exclude asthma
- Allergy testing — skin prick or specific IgE blood tests
- Immune bloods — immunoglobulins, vaccine responses, lymphocyte subsets
- Sweat test — where cystic fibrosis is possible
- Nasal nitric oxide and ciliary brushings — where primary ciliary dyskinesia is suspected
- Flexible bronchoscopy with a lung wash — to see the airway directly and identify exactly which organism is present, so treatment can be targeted rather than guessed
- CT chest — where bronchiectasis or a structural abnormality is a real possibility
What parents can do before the appointment
- Build a timeline. Dates of each infection, what was prescribed, whether it worked, and how long the child was well in between. This is genuinely the most useful thing you can bring.
- Collect previous X-rays and reports, including those from other countries or other hospitals.
- Note the cough's character — wet and productive, or dry and irritating. It points in very different directions.
- Record a video of the breathing or cough when it is bad.
- Bring all inhalers and spacers so we can check technique. Poor inhaler technique is a common reason asthma looks like recurrent infection.
- Check vaccinations are up to date, including annual influenza.
A note on antibiotics
Parents often arrive apologetic about how many antibiotic courses their child has had, or anxious that they have had too many. Neither reaction is quite right. The problem is rarely the antibiotics themselves; it is that repeated short courses without a diagnosis treat the episode and never the cause. Some of these children genuinely do need a longer, targeted course. Others need no antibiotics at all and have had asthma the whole time. The point of a proper assessment is to tell those two children apart.
A child who keeps getting chest infections is not simply unlucky. There is nearly always a reason, and in most cases it is treatable. The important thing is to stop treating the episodes and start investigating the pattern.
Common questions from parents
How many chest infections a year is too many in a child?
As a rough guide, more than one pneumonia in a year, or two or more in a lifetime, warrants specialist investigation. Repeated chest infections that always affect the same part of the lung should be investigated regardless of number.
What causes recurrent chest infections in children?
The commonest reasons are undiagnosed or undertreated asthma, protracted bacterial bronchitis, aspiration or swallowing difficulty, and allergic rhinitis with post-nasal drip. Less common but important causes include an inhaled foreign body, primary ciliary dyskinesia, cystic fibrosis, bronchiectasis, and immune deficiency.
What tests are done for recurrent chest infections?
Investigation usually starts with a chest X-ray, spirometry where the child is old enough, allergy testing and immune bloods. Depending on the pattern, it may extend to a sweat test, nasal nitric oxide and ciliary studies, a CT chest, or flexible bronchoscopy with a lung wash to identify the organism.
Is it normal for a child to get lots of coughs and colds?
Yes. Pre-school children commonly have six to eight viral infections a year, and children starting nursery may have more. The concern is not the number of colds but whether each one is going to the chest, needing antibiotics, causing fever and breathlessness, or leaving the child not fully recovered in between.
When should I see a paediatric pulmonologist?
See a specialist if your child has needed repeated antibiotic courses for chest infections, has never fully recovered between episodes, has poor weight gain or growth, has a persistently wet cough, or has had infections repeatedly in the same area of the lung.
