# Chronic Cough in Children > Chronic cough in children for NEET-PG Paediatrics: four-week definition, wet versus dry, protracted bacterial bronchitis and red flags. - Canonical URL: https://prepelephant.com/topics/neet-pg/paediatrics/chronic-cough-children - Exam / course: NEET-PG · Subject: Paediatrics - Publisher: PrepElephant (https://prepelephant.com) — Prepared and reviewed by the PrepElephant Academic Review Team - First published: 2026-10-02 - Last updated: 2026-10-02 - How to cite: "Chronic Cough in Children", PrepElephant, https://prepelephant.com/topics/neet-pg/paediatrics/chronic-cough-children ## Direct answer Chronic cough in a child means daily cough lasting more than four weeks — not the eight weeks used for adults — and the first branch point is wet versus dry. A wet, productively sounding cough points to protracted bacterial bronchitis (the commonest specific cause in young children), aspiration, cystic fibrosis, bronchiectasis or tuberculosis; a dry cough points to asthma or cough-variant asthma, post-viral cough, habit cough and, in India, always tuberculosis. Chest radiograph with growth plotting and spirometry (from about five to six years) forms the initial core, and treatment follows the cause: a two-to-four-week course of appropriate oral antibiotics that abolishes a wet cough both diagnoses and treats protracted bacterial bronchitis. Over-the-counter antitussives and adult-style empirical trials have no routine place. ## What you must remember - **Definition:** daily cough exceeding four weeks in a child; using the adult eight-week threshold delays diagnosis and is a recognised error. - **Protracted bacterial bronchitis (PBB):** wet cough for more than four weeks, no other pointers, and resolution within two weeks of starting amoxicillin-clavulanate (two weeks first, extended to four if partial response); recurrent PBB mandates evaluation for bronchiectasis and immune deficiency. - **Specific cough pointers that demand escalation:** failure to thrive or weight loss, digital clubbing, chest deformity (Harrison sulci), recurrent pneumonia in the same lobe, wheeze failing therapy, cough with feeding (aspiration), haemoptysis, and chronic wet cough past eight weeks. - **Asthma and cough-variant asthma:** dry, nocturnal, exercise- or trigger-associated cough with bronchodilator responsiveness; isolated daytime cough without wheeze or triggers rarely turns out to be asthma. - **Habit (tic) cough:** dry, honking, absent during sleep and absent when distracted, often after a viral illness; suggestion therapy and speech/behavioural techniques work, drugs do not. - **Retained airway foreign body:** any unilateral persistent wet cough or localised wheeze in a toddler, regardless of a witnessed choking history, needs bronchoscopy consideration. - **Indian reality:** tuberculosis sits high on every chronic cough differential — night sweats, contact history, failure to thrive and cervical lymphadenopathy push toward induced sputum/gastric aspirate sampling and chest imaging. ## Approach to diagnosis, step by step Walk a four-year-old with eight weeks of wet cough through the pathway. Step one: define the cough by observation — wet means purulent airway secretions even if the child never swallows sputum. Step two: examine for pointers — clubbing, growth trajectory, chest shape, localised findings. Step three: baseline tests — chest radiograph; in this child it is unremarkable. Step four: with a wet cough and no pointers, treat empirically for PBB with amoxicillin-clavulanate for two weeks. Cough abolishing completely confirms PBB and ends the workup; partial response extends the course to four weeks; no response redirects the search to bronchiectasis (high-resolution CT), immune deficiency (immunoglobulins), aspiration (videofluoroscopy, feeding review) and cystic fibrosis (sweat chloride — remember Indian babies may present atypically and a normal newborn screen, where available, does not exclude it). A dry cough runs a parallel but different algorithm: trial of bronchodilator for trigger-responsive symptoms, watchful waiting for post-viral cough up to a defined point, and recognition of the honking, sleep-disappearing habit cough that resolves with reassurance and behavioural work. ## Where students slip The reflexive errors are importing adult medicine — prescribing codeine-laced antitussives, or treating every cough as gastro-oesophageal reflux — when the paediatric evidence puts PBB, asthma, retained foreign body and TB first. A second slip is calling a wet cough "just a chest infection" repeatedly: three consecutive bouts of PBB or any wet cough beyond eight weeks is bronchiectasis until imaging says otherwise. The third, examinable point is direction of testing: spirometry is near-useless below five years, bronchoscopy is both diagnostic and therapeutic for foreign body, and a sweat chloride is cheaper than a CT — the order of investigation is itself a question. Finally, in the Indian setting, an untreated wet cough with evening fevers in a thin child is far more likely tuberculosis than any functional diagnosis. ## Frequently asked questions ### What duration defines chronic cough in children? More than four weeks of daily cough, a lower threshold than the eight weeks applied to adults. ### What is protracted bacterial bronchitis and how is it confirmed? A wet cough beyond four weeks caused by chronic endobronchial infection, typically resolving within two weeks of amoxicillin-clavulanate — the antibiotic response is itself diagnostic. ### When should bronchiectasis be suspected in a child with chronic wet cough? When cough persists beyond eight weeks, recurs as repeated PBB episodes, or is accompanied by clubbing, growth faltering or a chest radiograph with persistent changes. ### Which features characterise a habit cough in a child? A dry, honking cough that disappears during sleep and with distraction, usually following a viral illness, responding to behavioural and suggestion therapy rather than medication. ### Why must tuberculosis be considered early in an Indian child with chronic cough? TB remains endemic; contact exposure, evening fevers, night sweats and failure to thrive alongside chronic cough warrant early microbiological sampling and imaging.