Definition and the terminology controversy
“Reactive airway disease” (RAD) is not a formal diagnosis. It is an informal, ill-defined label applied to children with asthma-like symptoms — recurrent wheeze, cough or breathlessness — when the clinician is reluctant or unable to commit to a specific diagnosis. The term has no agreed definition or diagnostic criteria, and an influential editorial called it “a lazy term of uncertain meaning that should be abandoned.” It is frequently confused with the entirely separate, well-defined reactive airways dysfunction syndrome (RADS), an irritant-induced asthma after a single high-level inhalational exposure — RAD and RADS are not the same thing. This monograph exists to help clinicians move past the label to a precise diagnosis, not to legitimise it.
Why the term persists (and why it is a problem)
RAD is used most in young children (under 5), where objective confirmation of asthma is genuinely difficult: spirometry is usually not feasible and wheeze is common and often transient with viral infection. The label becomes a placeholder for “wheezy child, diagnosis pending.” The harm is twofold: it can delay a definitive asthma diagnosis and appropriate controller therapy, and it can obscure non-asthma causes of wheeze — bronchiolitis, viral-induced wheeze, foreign body, aspiration/reflux, tracheobronchomalacia, vascular ring, cystic fibrosis and other structural disease. Used loosely, it neither adds specificity nor guides management.
Working toward a real diagnosis
Treat RAD as a prompt to characterise the phenotype, not as an endpoint. Take a careful history of symptom pattern, triggers, atopy and family history; examine during and between episodes; and consider the child’s age. Where features fit — recurrent, variable, multi-trigger wheeze with atopy and response to bronchodilator/ICS — diagnose asthma per GINA 2025 (history of variable respiratory symptoms plus, where obtainable, documented variable expiratory airflow). Where features point elsewhere — first wheeze in an infant with coryza (bronchiolitis), abrupt onset (foreign body), failure to thrive or focal signs — pursue that path instead. A therapeutic trial of controller therapy with planned review is a legitimate strategy in preschoolers, but it should be named and time-limited, not left as “RAD.”
See the full criteria: Reactive Airway Disease
Red flags (do not attribute to “RAD”)
- Failure to thrive, clubbing or persistent productive cough — consider CF, bronchiectasis, immunodeficiency
- Sudden-onset wheeze or stridor in a well child — foreign body aspiration until excluded
- Focal or asymmetric findings, or fixed wheeze — structural or vascular airway lesion
- Wheeze from early infancy, feeding-related symptoms — aspiration, reflux, tracheobronchomalacia
- Severe distress, hypoxaemia or poor bronchodilator response — manage as acute exacerbation and reassess
Management overview
There is no “treatment of RAD” because RAD is not a disease — manage the underlying diagnosis. When the child meets asthma criteria, follow a stepwise inhaled-therapy approach: inhaled corticosteroid (ICS)-containing controller therapy with as-needed bronchodilator, correct inhaler/spacer technique, trigger control and a written action plan, stepping therapy up or down at review. Acute wheeze episodes are treated with inhaled short-acting bronchodilator via spacer, early systemic corticosteroids where indicated, and controlled oxygen. If the picture is bronchiolitis or another non-asthma cause, treat accordingly. The overarching principle is to replace the placeholder label with a specific, actionable diagnosis as soon as the clinical course allows.
References
- Fahy JV, O’Byrne PM. Am J Respir Crit Care Med, 2001.
- Douglas LC, Feder KJ. RAD: Reactive Airways Disease or Really Asthma Disease? Pediatrics. 2017;139(1):e20160625.
- Global Initiative for Asthma, 2025 update.
- Nelson Textbook of Pediatrics, 21st ed.
Decision support for qualified clinicians only — verify against current primary guidelines and your clinical judgement.