Overview
Nonallergic rhinitis refers to nasal congestion, runny nose, sneezing, or postnasal drip that is not caused by allergy or infection. It results from dysfunction of the autonomic nervous system controlling nasal blood vessels and mucus glands. Triggers include environmental irritants, weather changes, foods, and hormonal changes. Unlike allergic rhinitis, allergy testing is negative.
How common is it?
Nonallergic rhinitis affects about 20 to 30% of people with rhinitis symptoms. It is less common than allergic rhinitis but often coexists with it (mixed rhinitis). It is more common in women and over age 20.
Causes and risk factors
Hyperresponsive nasal vasculature and abnormal neural control cause exaggerated mucosal responses to various triggers, without an IgE-mediated allergic mechanism.
Common risk factors
- Environmental irritants: cigarette smoke, strong odours, chemical fumes, air pollution
- Weather changes: cold air, humidity changes
- Emotional factors and stress
- Spicy foods and alcohol (gustatory rhinitis)
- Hormonal changes: pregnancy, menopause, hypothyroidism
- Medications: nasal decongestant sprays (rhinitis medicamentosa from prolonged use), ACE inhibitors, beta-blockers, aspirin and NSAIDs
- Occupational exposures
- Vasomotor rhinitis: idiopathic autonomic dysregulation
Symptoms
- Nasal congestion or stuffiness
- Runny nose (often watery, not purulent)
- Postnasal drip causing cough or throat clearing
- Sneezing
- No or minimal itching (distinguishes from allergic rhinitis)
- Symptoms triggered by specific irritants rather than seasonal patterns
When to see a doctor
See a doctor if symptoms significantly affect sleep, work, or daily life, or if unilateral nasal symptoms occur (requires investigation to exclude structural or malignant cause).
Diagnosis
Clinical history and examination. Skin prick or RAST testing to exclude allergy. Nasal endoscopy if structural cause suspected. Blood tests: thyroid function, eosinophil count.
Treatments
Trigger avoidance
Identifying and avoiding specific triggers (e.g. stopping nasal decongestant sprays causing rhinitis medicamentosa, improving ventilation, fragrance avoidance) is the most important first step.
Ipratropium bromide nasal spray
Anticholinergic spray particularly effective for rhinorrhoea-predominant nonallergic rhinitis. Reduces nasal secretions without addressing congestion.
Intranasal corticosteroid sprays
Less effective in pure nonallergic rhinitis than in allergic rhinitis but reduce overall mucosal inflammation. Used as first-line in mixed rhinitis.
Saline irrigation
Twice-daily nasal saline rinse improves mucociliary clearance, removes irritants, and reduces symptoms. Safe, cheap, and evidence-based.
Self-care and lifestyle
- Identify and eliminate or reduce all specific triggers
- Use saline rinses morning and evening
- Keep car and home heating systems maintained to reduce dust and mould
- Avoid decongestant nasal sprays (oxymetazoline, xylometazoline) for more than 5 to 7 days — causes rebound congestion
Prevention
Avoidance of known triggers is the only effective prevention. Rhinitis medicamentosa can be prevented by limiting decongestant nasal spray use.