One Airway, One Disease
The nose, sinuses, and lungs are part of a single continuous airway. When inflammation affects one part, it almost always affects the rest. This is the core concept behind United Airway Disease — the recognition that allergic rhinitis (nasal allergy) and asthma are two expressions of the same underlying inflammatory process, not two separate conditions.
Studies consistently show that 80% of asthma patients have allergic rhinitis, and 20–30% of rhinitis patients have asthma. If you have one, you are at significantly elevated risk of developing the other.
How Does Rhinitis Worsen Asthma?
There are several mechanisms by which untreated nasal allergy directly worsens asthma:
- Mouth breathing: A blocked nose forces breathing through the mouth. The mouth does not warm, humidify, or filter air the way the nose does — delivering cold, dry, particle-laden air directly to the lungs.
- Nasal drainage: Postnasal drip from inflamed sinuses irritates the throat and upper airways, triggering cough and bronchoconstriction.
- Systemic inflammation: Inflammatory mediators produced in the nasal mucosa enter the bloodstream and prime the bronchial airways to react more strongly.
- Nasal nitric oxide: The nose produces nitric oxide, which has a bronchodilating effect on the lower airways. Blocked nasal breathing reduces this protective effect.
The Clinical Evidence
Multiple large studies have shown that treating allergic rhinitis with nasal corticosteroid sprays reduces asthma exacerbation rates, emergency visits, and hospitalisations. One landmark study found that adding a nasal steroid spray to standard asthma treatment reduced emergency department visits for asthma by over 30%.
What This Means for You
If your asthma is not well controlled despite correct inhaler use — and you also have nasal symptoms (blocking, runny nose, sneezing, postnasal drip) — the nasal component may be driving your asthma. Treating the nose is treating the asthma.
At Respire, our ENT and respiratory physicians work together precisely because of this. A patient who comes in for asthma is also assessed for rhinitis, sinus disease, and nasal polyps — because addressing all of them together produces better outcomes than addressing each in isolation.
Treatment Approach for United Airway Disease
- Nasal corticosteroid spray (mometasone, fluticasone nasal) daily — reduces nasal inflammation and indirectly benefits the lower airways
- Antihistamines for allergic component — particularly in pollen season
- Allergen avoidance strategies (dust mite, mould, pollen)
- Allergy immunotherapy (desensitisation) for patients with confirmed allergen sensitisation — the only treatment that modifies the underlying disease rather than just controlling symptoms
- Optimal asthma preventer therapy alongside nasal treatment
When to See Both Specialists
If you have both nasal symptoms and asthma — or if one condition is significantly worse than the other — an integrated assessment by both an ENT specialist and a respiratory physician in the same clinic gives you a treatment plan that addresses the full picture. That is the Respire model.