Select cough quality, triggers, associated symptoms, and duration → differentiate asthma, UACS, GERD, pertussis, FB aspiration, or psychogenic cough. Chronic cough ≥4 weeks.
⚠️ Red flags: choking/gagging at onset, hemoptysis, digital clubbing, stridor, failure to thrive, unimmunized infant.
Select cough quality (barking, staccato, honking, nocturnal), triggers (exercise, feeding, supine), associated wheezing, and age → differential includes asthma, UACS, GERD, pertussis, foreign body, habit cough.