A runny nose is one of the most common symptoms of childhood, and most parents are well acquainted with the seemingly endless nasal discharge of the early nursery and preschool years. The cause is almost always viral — young children in group settings typically have six to eight viral upper respiratory infections per year. However, rhinitis that is persistent, recurrent, or associated with itching, sneezing in rapid succession, or clear watery discharge that is not accompanied by other cold symptoms may indicate allergic rhinitis, which has a different cause and different management.
Understanding the distinction between infectious and allergic rhinitis, what allergic rhinitis looks like in young children, and how it relates to eczema and asthma helps parents recognise the pattern and seek appropriate support.
Healthbooq supports parents with evidence-based information on common childhood health conditions, including the atopic conditions that frequently overlap in early childhood.
Infectious Rhinitis: The Common Cold
Viral rhinitis — the common cold — is characterised by runny nose that typically begins watery and clear, may become thick and discoloured (yellow or green) after a few days, and is accompanied by sneezing, sometimes a mild sore throat or cough, and possibly a low-grade fever. Discoloured nasal discharge does not indicate bacterial infection and does not require antibiotics; it reflects the normal immune response to a viral infection.
Young children in group settings have frequent colds because they are repeatedly exposed to viruses their immune system has not previously encountered. A child who has started nursery and seems to have a continuous runny nose through the autumn and winter is almost always experiencing repeated viral infections, not a single prolonged illness.
Allergic Rhinitis in Young Children
Allergic rhinitis occurs when the nasal lining mounts an allergic (IgE-mediated) response to an inhaled allergen. In adults and older children, pollen (seasonal/hay fever) is a common trigger. In young children, perennial allergens — house dust mite (in bedding, carpets, and soft furnishings) and pet dander — are more common triggers than pollen, though pollen allergy does occur.
Symptoms of allergic rhinitis differ from a cold in several ways: the discharge tends to be persistently clear and watery rather than progressing through coloured phases; sneezing tends to come in bursts; the child may rub their nose (the "allergic salute"), eyes, or roof of mouth; there is typically no fever; and symptoms persist rather than resolving within a week or two.
Allergic rhinitis in young children frequently coexists with eczema and, in some children, asthma — the so-called atopic triad. A child with moderate-to-severe eczema who then develops rhinitis and/or wheeze is showing the classic atopic march.
Management
For infectious rhinitis, management is symptomatic: saline nasal drops or spray to help clear mucus (particularly important before feeds in young babies), a nasal aspirator for very young infants, and adequate hydration.
For allergic rhinitis, management has several components. Allergen reduction — particularly house dust mite reduction (mattress and pillow covers, hot washing of bedding, reduced carpet in sleeping areas) — is a practical first step. Intranasal corticosteroid sprays (such as mometasone) are the most effective treatment for allergic rhinitis and are recommended from age two in guidelines; some preparations are licensed from younger ages. Non-sedating antihistamines (such as loratadine or cetirizine) are useful for itching and sneezing but less effective for nasal blockage. Choices for under-two-year-olds are limited and should be discussed with a GP.
Key Takeaways
Rhinitis — inflammation of the nasal lining causing runny or blocked nose, sneezing, and sometimes itching — is either infectious (caused by viruses, the most common cause of runny nose in young children) or allergic/non-allergic in origin. Allergic rhinitis in young children is typically triggered by perennial allergens (house dust mite, pet dander) rather than pollen alone. In young children it frequently coexists with eczema and asthma as part of the atopic triad. Management of allergic rhinitis includes allergen reduction, intranasal corticosteroids, and antihistamines — but treatment choices in under-two-year-olds are limited and require medical guidance.
