The Breathless Child: Stridor, Wheeze and Foreign Bodies
Paediatrics — Respiratory Illness in Children, NMC MBBS licence examination syllabus (Nepal Medical Council).
The breathless child: stridor, wheeze and what they mean
Listen to where the noise is, and most of the differential resolves itself.
A child's airway is small, and small airways obstruct easily. That single anatomical fact explains why children get noisy breathing so much more readily than adults, why they deteriorate faster once obstructed, and why a degree of swelling that an adult would barely notice can be critical in a toddler.
The organising principle here is that the sound localises the problem. Stridor comes from above the thoracic inlet, wheeze from below it, and each points to a different list of causes and a different urgency. Get that right and the rest follows.
🩺 Where this lives: A silent chest in a distressed child is the most dangerous sign in this chapter, and it is regularly misread as improvement. Wheeze requires air movement to generate it; when a severely obstructed child stops wheezing and the chest goes quiet, it usually means too little air is moving to make a noise. The same reversal applies to a child who becomes drowsy and calm after a period of agitation. Getting quieter is not the same as getting better.
💡 A note on scope and numbers. This chapter gives no doses and no saturation thresholds — paediatric dosing is weight-based and severity criteria are protocol-specific. Childhood pneumonia, the respiratory rate thresholds and chest indrawing are covered in the Childhood Infections chapter; adult asthma and COPD in their own chapter; and tuberculosis generally in the Microbiology chapter. Each is referenced here rather than repeated.
Stridor or wheeze?
This is the first question, and it is answered by listening at the right place. Stridor is harsh, predominantly inspiratory, loudest over the neck, and means obstruction in the larynx or trachea. Wheeze is musical, predominantly expiratory, heard over the chest, and means obstruction in the bronchi and bronchioles. One further pattern is worth having ready: sudden onset in a previously well child points towards an inhaled foreign body regardless of which noise is present.
Croup and epiglottitis
THE RULE THAT OVERRIDES CURIOSITY
IN A CHILD WITH STRIDOR AND SUSPECTED EPIGLOTTITIS:
DO NOT examine the throat
DO NOT lie the child flat
DO NOT take blood or attempt cannulation
DO NOT separate the child from the parent
Any of these can precipitate complete airway obstruction in
an epiglottis that is already critically swollen. The child
has usually found the position that keeps the airway open —
typically sitting up and leaning forward — and should be
left in it.
WHAT TO DO INSTEAD:
Keep the child calm and with a parent
Give oxygen if tolerated without distress
CALL THE MOST SENIOR AIRWAY HELP AVAILABLE IMMEDIATELY —
anaesthesia and ENT where available
Definitive examination happens in a setting where the
airway can be secured
THE DISCRIMINATING FEATURES:
CROUP gradual onset, BARKING cough, hoarse voice,
preceding coryza, child can swallow
EPIGLOTTITIS rapid onset over hours, little cough,
DROOLING because swallowing hurts, muffled
voice, toxic and febrile
Hib vaccination has made epiglottitis considerably rarer
where coverage is good — but it has not abolished it, and
it must still be recognised.
Wheeze by age
💡 Exam angle: age is the strongest single clue in a wheezy child. An infant with coryza followed by cough, wheeze, fine crackles and poor feeding is describing bronchiolitis; the feature to watch for in small infants is apnoea. A recurrent, variable, night-worse wheeze in an older child with atopy and triggers is describing asthma. And in either, the severity assessment is the same: can the child feed and talk? A child too breathless to feed is a child in trouble.
Inhaled foreign body
This is a diagnosis made by history rather than by examination or imaging. A clear account of a sudden choking episode in a toddler is powerful evidence, and a normal chest X-ray does not exclude it — most inhaled objects are food and are not radio-opaque. Signs may be asymmetric, with unilateral wheeze or reduced air entry. Missed foreign bodies present weeks later as recurrent or non-resolving pneumonia in the same lobe, which is why the choking history is worth asking about explicitly in that situation.
Tuberculosis in children
WHY CHILDHOOD TB IS DIFFERENT
HARDER TO CONFIRM
Young children swallow rather than expectorate sputum,
and their disease is PAUCIBACILLARY — few organisms. So
bacteriological confirmation frequently fails, and a
negative result does NOT exclude the diagnosis.
SO THE DIAGNOSIS RESTS ON A COMBINATION:
CONTACT HISTORY — the single most useful question
Persistent cough not responding to usual treatment
WEIGHT LOSS or growth faltering
Prolonged fever
Chest imaging and, where available, tuberculin or
interferon testing per national protocol
MORE DANGEROUS
Young children, particularly infants, progress from
infection to disease faster and are more likely to
DISSEMINATE — producing MILIARY TB and TUBERCULOUS
MENINGITIS, both of which carry high mortality and
disability.
THEREFORE: SCREEN CHILD CONTACTS of any adult diagnosed
with pulmonary TB, and consider preventive treatment per
national guidance. This is one of the highest-value
activities in a TB programme.
Regimens and durations come from the national TB
programme.
Clinical reasoning: four presentations
🔍 Case 1 — the child who stopped wheezing
PresentationA child with a severe asthma attack has been wheezing loudly for an hour. The wheeze now diminishes and the chest is quiet. He is drowsy and no longer agitated. The team notes he seems calmer.
TrapReading quiet as improved.
ReasoningA silent chest means insufficient air movement to generate wheeze — this is worse, not better. Drowsiness in an exhausted breathless child suggests rising carbon dioxide and impending respiratory failure.
AnswerTreat as life-threatening. Oxygen, urgent escalation of treatment per protocol, and immediate senior and intensive care involvement.
🔍 Case 2 — drooling and sitting forward
PresentationA 4-year-old has stridor developing over a few hours, high fever, a muffled voice and drooling. He sits upright leaning forward and will not lie down. A doctor prepares to examine his throat with a tongue depressor and take blood.
DangerBoth actions could precipitate complete obstruction.
ReasoningRapid onset, drooling, muffled voice and the tripod position suggest epiglottitis. The child has adopted the position that maintains his airway, and distress or supine positioning can close it.
AnswerDo not examine the throat, take blood, or lie him down. Keep him calm with his parent, give oxygen if tolerated, and summon the most senior airway help immediately.
🔍 Case 3 — sudden cough in a toddler
PresentationA previously well 2-year-old developed abrupt coughing and choking while eating peanuts three days ago. He now has a persistent cough with unilateral wheeze. The chest X-ray is reported as normal, and he is treated for a viral illness.
Key clueAn unambiguous choking episode in a well child.
ReasoningThis is an inhaled foreign body until proven otherwise. Most inhaled objects are food and not radio-opaque, so a normal film excludes nothing. Asymmetric findings support it.
AnswerRefer for bronchoscopy. A clear choking history warrants it even with normal examination and imaging — missed foreign bodies return as recurrent pneumonia in the same lobe.
🔍 Case 4 — a cough that will not settle
PresentationA 5-year-old has coughed for six weeks, lost weight and has intermittent fever. Two courses of antibiotics have not helped. Her grandmother, who lives with the family, has been coughing for months. Sputum cannot be obtained.
The decisive questionWho else at home is coughing?
ReasoningPersistent cough, weight loss, prolonged fever, failure to respond to antibiotics and a household contact make tuberculosis likely. Inability to obtain sputum is expected in a child and does not argue against it.
AnswerInvestigate for TB per national protocol, including imaging, and also assess the grandmother — the index case needs diagnosing and every child contact screening.
Commonly confused
Confusion
The distinction
Why it matters
Stridor vs wheeze
Inspiratory at the neck versus expiratory over the chest
Localises upper versus lower airway.
Quiet chest vs improvement
No air moving makes no noise
A silent chest is an emergency.
Calm vs exhausted
Drowsiness suggests respiratory failure
The same reversal as the silent chest.
Croup vs epiglottitis
Barking cough versus drooling and toxicity
One is managed, the other is an airway emergency.
Examining vs not examining the throat
Never in suspected epiglottitis
It can precipitate total obstruction.
Bronchiolitis vs asthma
Infant with coryza versus recurrent variable wheeze
Age is the strongest clue.
Normal X-ray vs no foreign body
Most inhaled objects are not radio-opaque
History decides, not imaging.
Negative test vs no TB in a child
Childhood TB is paucibacillary
Diagnosis rests on the whole picture.
Rapid revision
MUST-KNOW FACTS
1. A child's airway is small — it obstructs easily and fast.
2. THE NOISE LOCALISES THE OBSTRUCTION.
3. STRIDOR: inspiratory, harsh, at the neck — UPPER airway.
4. WHEEZE: expiratory, musical, over the chest — LOWER airway.
5. A SILENT CHEST in a distressed child is an EMERGENCY.
6. Drowsiness in a breathless child suggests respiratory failure.
7. Sudden onset in a well child — think FOREIGN BODY.
8. CROUP: gradual, BARKING cough, hoarse, preceding coryza.
9. EPIGLOTTITIS: rapid, DROOLING, muffled voice, toxic, no cough.
10. NEVER examine the throat in suspected epiglottitis.
11. Do not lie the child flat, take blood, or separate from the parent.
12. Leave the child in the position they have adopted.
13. Call the most senior AIRWAY help immediately.
14. Hib vaccination has made epiglottitis much rarer.
15. INFANT wheeze: BRONCHIOLITIS — coryza, cough, crackles, poor feeding.
16. Watch for APNOEA in small infants with bronchiolitis.
17. OLDER CHILD wheeze: ASTHMA — recurrent, variable, night cough, atopy.
18. Severity in any wheezy child: can they FEED and TALK?
19. Other severity signs: recession, drowsiness, cyanosis, silent chest.
20. FOREIGN BODY is diagnosed by HISTORY.
21. A NORMAL CHEST X-RAY DOES NOT EXCLUDE a foreign body.
22. Signs may be asymmetric — unilateral wheeze or reduced air entry.
23. A clear choking history warrants bronchoscopy.
24. Missed foreign bodies return as recurrent or non-resolving pneumonia.
25. Childhood TB is PAUCIBACILLARY and children rarely produce sputum.
26. A negative bacteriological test does NOT exclude childhood TB.
27. Diagnosis rests on CONTACT HISTORY, cough, weight loss, fever, imaging.
28. Young children progress faster and DISSEMINATE.
29. MILIARY TB and TB MENINGITIS carry high mortality.
30. SCREEN CHILD CONTACTS of any adult with pulmonary TB.
31. Pneumonia and respiratory rate thresholds are in the Childhood Infections chapter.
💡 Exam angle: three questions carry this chapter. Where is the noise — neck or chest? Is the child feeding and talking? And did this start suddenly in a previously well child? Between them they separate upper from lower airway, mild from life-threatening, and infection from inhaled foreign body.
Syllabus points
Why a child's airway obstructs easily
Stridor versus wheeze
The silent chest as an emergency
Croup and its features
Epiglottitis and the rule against examining
Bronchiolitis in infants
Asthma in older children
Judging severity: feeding and talking
Inhaled foreign body diagnosed by history
Why a normal X-ray excludes nothing
Why childhood TB is harder to confirm
Screening child contacts
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