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?
Non-allergic rhinitis can occur with irritants, weather changes, hormonal changes or certain medicines. Similar symptoms can have allergic or non-allergic causes, so persistent symptoms need assessment.
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
Identify triggers and reduce exposure where possible. If a medicine or prolonged decongestant use may contribute, ask a pharmacist or prescriber for a plan rather than changing prescribed treatment yourself.
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
Saline rinses may ease symptoms and remove irritants. Use a ready-made product or a solution made with water that has been boiled and cooled; follow the product instructions and keep equipment clean.
Self-care and lifestyle
- Identify and eliminate or reduce all specific triggers
- Use saline rinses as advised, with sterile/distilled or previously boiled and cooled water; keep the equipment clean.
- 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
Avoiding known irritants can help. Follow the label for decongestant nasal sprays or drops and do not use for more than 5 days because congestion can rebound. Prescribed steroid sprays have different instructions. Persistent symptoms need assessment.
Sources for targeted updates
Updated: 24 October 2026. Targeted corrections to treatment, self-care, key facts, prevention, frequency. This update covers the named sections; a full review of the remaining guide is pending.