What it is
Runny nose / rhinorrhoea involves excess nasal secretion from viral infection, allergy, sinusitis, or environmental irritants.
Excess nasal discharge, commonly from viral infection, allergic rhinitis, or sinusitis; usually self-limiting but occasionally indicating more significant pathology.

At a glance
What it is
Runny nose / rhinorrhoea involves excess nasal secretion from viral infection, allergy, sinusitis, or environmental irritants.
Commonly experienced as
Evidence context
Research-supportedSee the evidence snapshotSafety
See staying safeContext
Rhinorrhoea (colloquially, runny nose) describes excess production or drainage of nasal secretions from the nasal mucosa. Secretion characteristics are diagnostically relevant: clear watery discharge suggests viral rhinitis, allergic rhinitis, or vasomotor rhinitis; thick yellow or green discharge suggests bacterial superinfection or sinusitis; blood-stained discharge warrants investigation; and clear unilateral discharge following head trauma may represent cerebrospinal fluid (CSF) leakage — a serious finding. The nasal mucosa is one of the body's primary immunological interfaces, with mucociliary clearance and IgA secretion forming key defence mechanisms. Chronic rhinorrhoea may reflect allergic sensitisation, non-allergic vasomotor rhinitis, nasal polyps, structural abnormalities, or systemic conditions including hypothyroidism.
The Evidence
What the research says about causes, care options, and when a runny nose needs professional attention.
Well-understood symptom with strong evidence for common causes
Runny nose is one of the most studied respiratory symptoms, with strong evidence guiding care for allergic and viral causes. Most cases are self-limiting, but certain features — particularly unilateral or blood-stained discharge — require prompt professional assessment.
Clear unilateral discharge after a head injury may indicate cerebrospinal fluid leakage — seek urgent care. Blood-stained discharge without known trauma, or unilateral symptoms alongside changes in smell, vision, or hearing, warrant professional assessment. Thick discharge with fever and facial pain lasting beyond 10 days may indicate bacterial sinusitis.
Intranasal corticosteroid sprays are strongly evidenced as first-line care for allergic rhinitis. Second-generation antihistamines such as cetirizine and loratadine have strong evidence for symptom control. Saline nasal irrigation has good evidence for relief in both acute and chronic rhinosinusitis. Vitamin C and zinc have moderate evidence for shortening viral rhinitis duration.
Topical nasal decongestants such as oxymetazoline should not be used for more than 3 to 5 days — prolonged use can cause rebound congestion known as rhinitis medicamentosa. Herbal preparations with vasoconstrictive properties should be used cautiously by people with high blood pressure. Always check interactions with existing medications or conditions.
Clear watery discharge typically suggests viral, allergic, or vasomotor rhinitis. Thick yellow or green discharge may indicate bacterial involvement or sinusitis. Chronic rhinorrhoea can reflect nasal polyps, structural issues, or systemic conditions including hypothyroidism. Discharge characteristics are one factor a clinician will consider during assessment.
Traditional Chinese Medicine views acute rhinorrhoea as Wind-Cold or Wind-Heat affecting the Lung system, using warming or dispersing herbs accordingly. Ayurveda employs Nasya nasal therapy and spice-based formulas to clear congestion. Naturopathic approaches often emphasise steam inhalation and dietary adjustments. Evidence for these approaches varies; discuss with a qualified practitioner.
For common viral or allergic causes, evidence-based self-care and over-the-counter options are often sufficient. Persistent, recurrent, or unusual presentations benefit from assessment by a qualified health professional to identify underlying causes. Complementary approaches may support comfort alongside conventional care, but are not a substitute for professional assessment where red flags are present.
Safety first
General, informational guidance — not diagnostic. A qualified practitioner can advise on your own situation.
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