Paeds · respiratory-sleep-and-airway
Chronic cough: diagnostic approach
Also known as Persistent cough in children · Chronic paediatric cough · Prolonged cough · Wet cough in children · Chronic wet cough evaluation
Fellowship guide to chronic cough in children — the four-week threshold, the wet-versus-dry split that drives the whole work-up, protracted bacterial bronchitis as the commonest cause, the specific-cough pointers that flag serious disease, and the evidence-based algorithm that turns a vague symptom into a diagnosis.
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Target exams
Red flags
- A chronic wet or productive cough is protracted bacterial bronchitis until proven otherwise and demands a trial of antibiotics, not reassurance — untreated it progresses to bronchiectasis
- Cough from birth or the neonatal period points to congenital airway, cardiac, or aspiration disease and needs specialist imaging
- Sudden-onset cough with a choking episode is an inhaled foreign body until excluded, even with a normal chest X-ray
- Failure to thrive, clubbing, chest-wall deformity, or a wet cough that never fully clears signals suppurative lung disease or cystic fibrosis
- Haemoptysis, exertional dyspnoea, or a focal chest sign mandates imaging and specialist referral, never a symptomatic cough suppressant
- Do not diagnose asthma, reflux, or upper-airway cough syndrome reflexively in a young child — these adult triad causes rarely explain an isolated paediatric cough
Life stages
Care settings
Clinical exam formats
Board mappings
- Respiratory Medicine
- General and Community Paediatrics
- Chronic cough evaluation
- Paediatric respiratory and sleep medicine competencies
- Diagnosis and management of chronic cough and suppurative lung disease
- Current 2026 PREP curriculum — chronic cough algorithms and protracted bacterial bronchitis
- Clinical Applications
- Systematic evaluation of the child with chronic cough
- Long and Short Cases
- Respiratory scenarios and chronic cough
- 1. Good clinical care: Managing complexity and uncertainty
- Respiratory: Evaluates and manages the child with chronic cough
- Foundation of Practice (FOP)
- Applied Knowledge in Practice (AKP)
- Respiratory medicine
- Clinical
- Respiratory assessment and management
- History taking and management planning
- General Pediatrics Content Outline — Respiratory system
- Chronic cough and lower airway disease
- General Pediatrics EPA: Evaluate the child with a chronic respiratory symptom
- Patient Care: Evaluation of chronic respiratory symptoms
- Medical Knowledge: Paediatric airway and suppurative lung disease
- Systems-Based Practice: rational use of imaging and antibiotics in chronic cough
- Medical Expert
- Paediatric respiratory assessment and chronic cough management
- Pediatrics Core EPA — Assessing and managing chronic cough
Overview & Definition
A parent brings a four-year-old to clinic exhausted, describing a cough that has run for six weeks, wakes the household, and has already earned two courses of salbutamol that did nothing. The temptation is to reach for the adult reflexes — asthma, reflux, post-nasal drip — but in a child that instinct is usually wrong. The first move is quieter and far more powerful: listen to the cough and ask whether it is wet or dry, and count how long it has truly lasted. [1]
Chronic cough is defined by duration, and the paediatric threshold is a daily cough persisting for more than four weeks. This is deliberately shorter than the eight-week adult definition, because a child who is still coughing at a month rarely has a lingering viral tail and more often has an identifiable, treatable cause. Between three and four weeks sits a grey zone of "prolonged acute cough," most of which is post-viral and settles, but the four-week mark is the point at which a systematic work-up becomes mandatory. [1] [2]
The reason the definition matters is that it forces a decision rather than a wait. An isolated dry cough in an otherwise well, thriving child with a normal examination and chest X-ray is usually non-specific and self-limiting, and the safest management is watchful review. A wet cough, by contrast, almost always signals airway secretions that need explaining, and it is the finding that should never be waved away as "just a virus." [2]
References11ShowHide
- [1]Chang AB, Landau LI, Van Asperen PP, et al Cough in children: definitions and clinical evaluation. Med J Aust, 2006.PMID 16618239
- [2]Chang AB, Glomb WB Guidelines for evaluating chronic cough in pediatrics: ACCP evidence-based clinical practice guidelines. Chest, 2006.PMID 16428719
- [3]Marchant JM, Masters IB, Taylor SM, et al Evaluation and outcome of young children with chronic cough. Chest, 2006.PMID 16685002
- [4]Chang AB, Oppenheimer JJ, Weinberger MM, et al Management of Children With Chronic Wet Cough and Protracted Bacterial Bronchitis: CHEST Guideline and Expert Panel Report. Chest, 2017.PMID 28143696
- [5]Chang AB, Oppenheimer JJ, Weinberger M, et al Use of Management Pathways or Algorithms in Children With Chronic Cough: CHEST Guideline and Expert Panel Report. Chest, 2017.PMID 28104362
- [6]Kantar A, Chang AB, Shields MD, et al ERS statement on protracted bacterial bronchitis in children. Eur Respir J, 2017.PMID 28838975
- [7]Marchant J, Masters IB, Champion A, et al Randomised controlled trial of amoxycillin clavulanate in children with chronic wet cough. Thorax, 2012.PMID 22628120
- [8]Chang AB, Robertson CF, Van Asperen PP, et al A cough algorithm for chronic cough in children: a multicenter, randomized controlled study. Pediatrics, 2013.PMID 23610200
- [9]O'Grady KF, Grimwood K, Torzillo PJ, et al. Effectiveness of a chronic cough management algorithm at the transitional stage from acute to chronic cough in children: a multicenter, nested, single-blind, randomised controlled trial. Lancet Child Adolesc Health, 2019.PMID 31635952
- [10]Wark PA, Marchant JM Cough in Children and Adults: Diagnosis, Assessment and Management (CICADA). Summary of an updated position statement on chronic cough in Australia. Med J Aust, 2024.PMID 38600861
- [11]Newcombe PA, Sheffield JK, Petsky HL, et al A child chronic cough-specific quality of life measure: development and validation. Thorax, 2016.PMID 26842959