VHOSPITAL.CLINIC · Differential Diagnosis
Allergic Rhinitis (Hay Fever) vs Sinusitis
Clinical comparison — shared symptoms, key differences, distinguishing diagnostic tests, treatment pathways, and when to seek urgent evaluation.
Condition Overview
Condition A
Allergic Rhinitis (Hay Fever)
Allergic rhinitis is an allergic response to allergens such as pollen, dust mites, or pet dander, causing sneezing, runny nose, nasal congestion, and itchy eyes. Seasonal (hay fever) and perennial types are the main categories.
Condition B
Sinusitis
Sinusitis is inflammation of the sinuses, often following a cold or allergy. It causes facial pain, nasal congestion, thick nasal discharge, and reduced sense of smell. Acute sinusitis lasts up to 4 weeks; chronic sinusitis persists over 12 weeks.
Shared Symptoms — Why They're Confused
Both conditions present with 2 overlapping symptoms, making clinical differentiation essential.
Key Clinical Differences
Allergic Rhinitis (Hay Fever)
- Bilateral nasal congestion and clear rhinorrhoea
- Sneezing, itching, nasal obstruction
- Seasonal or perennial pattern
- Associated conjunctivitis common
Sinusitis
- Facial pain/pressure over affected sinuses
- Purulent (yellow-green) nasal discharge
- Fever and systemic malaise
- Toothache (maxillary sinusitis)
Distinguishing Diagnostic Tests
| Test | Allergic Rhinitis (Hay Fever) | Sinusitis |
|---|---|---|
| Nasal endoscopy | Pale, boggy, bluish mucosa — eosinophilic inflammation | Purulent discharge from sinus ostia — bacterial infection |
| Skin prick test / specific IgE | Positive allergen-specific IgE (dust mite, pollen, pet dander) | Negative — no allergic sensitisation in acute sinusitis |
| CT paranasal sinuses | Mucosal thickening without opacification | Air-fluid levels or complete opacification of sinuses |
Treatment Approaches
Allergic Rhinitis (Hay Fever)
- •Intranasal corticosteroid spray
- •Antihistamines
- •Allergen avoidance; immunotherapy for severe disease
Sinusitis
- •Saline nasal irrigation
- •Analgesics for facial pain
- •Antibiotics if bacterial (>10 days, purulent, worsening)
When Doctors Consider Each Diagnosis
🔵 Consider Allergic Rhinitis (Hay Fever) when:
- →Bilateral symptoms, itchy nose and eyes, clear discharge, seasonal pattern
🟢 Consider Sinusitis when:
- →Unilateral facial pain, purulent discharge, fever, odontogenic pain
Explore Each Condition in Detail
Related Clinical Pages
Allergic Rhinitis (Hay Fever)
Medical References
Content on this page is informed by evidence-based clinical sources including:
- World Health Organization (WHO)Global health guidance and disease classification
- National Health Service (NHS)UK clinical guidelines and patient information
- National Institute for Health and Care Excellence (NICE)Evidence-based clinical practice guidelines
- Centers for Disease Control and Prevention (CDC)US public health data and clinical recommendations
- PubMed – NCBIPeer-reviewed biomedical literature and clinical studies
- Cochrane LibrarySystematic reviews and meta-analyses in evidence-based medicine
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