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This is a clinician-written, evidence-based summary aligned to the USMLE Step 2 CK Content Outline. It is intended for medical students preparing for USMLE Step 2 CK. Management reflects current ACC/AHA, USPSTF, and APA guidelines. Always cross-reference with UpToDate, institutional protocols, and clinical judgment.
The Bottom Line
- Allergic rhinitis is an IgE-mediated response to inhaled allergens with sneezing, nasal itching, rhinorrhea, and congestion
- Diagnosis is usually clinical; allergy testing is useful when diagnosis is uncertain, symptoms are refractory, or immunotherapy is being considered
- Intranasal corticosteroids are the most effective monotherapy, especially for nasal congestion
- Second-generation oral antihistamines help sneezing and itching and are preferred over sedating first-generation agents
- Avoid routine sinus imaging, broad food allergy testing, and depot parenteral steroids for uncomplicated allergic rhinitis
Overview
Allergic rhinitis is an IgE-mediated inflammatory disorder of the nasal mucosa triggered by seasonal or perennial allergens such as pollen, dust mites, animal dander, molds, or cockroach allergen. It is strongly associated with asthma, atopic dermatitis, allergic conjunctivitis, sinusitis, otitis media, and sleep disturbance. The practical Step 2 CK distinction is from viral URI and nonallergic rhinitis: allergic rhinitis tends to involve itching, sneezing, clear rhinorrhea, pale boggy turbinates, and exposure-linked recurrence.
Epidemiology
Allergic rhinitis is common in children and adults and is one of the most prevalent chronic diseases in the United States. Seasonal allergic rhinitis is often pollen-driven, whereas perennial symptoms suggest dust mites, molds, cockroach, or animal dander. Risk factors include family history of atopy, asthma, eczema, urban exposure, and sensitization to indoor allergens. It can impair sleep, school performance, and productivity, and uncontrolled rhinitis can worsen asthma control.
Clinical Features
Symptoms
Sneezing, nasal itching, clear watery rhinorrhea, and nasal congestion
Itchy, watery, red eyes suggesting allergic conjunctivitis
Postnasal drip, cough, throat clearing, or hyposmia
Seasonal pattern or symptoms after dust, animal, mold, or pollen exposure
Fever, purulent discharge, severe unilateral pain, or symptoms improving then worsening suggest infection rather than allergy
Unilateral obstruction or epistaxis should prompt evaluation for structural lesion or tumor
Signs
Pale, boggy, edematous turbinates with clear secretions
Allergic shiners, Dennie-Morgan lines, or transverse nasal crease from allergic salute
Cobblestoning of posterior pharynx from chronic postnasal drip
Wheezing or eczema may coexist as part of atopy
Nasal polyps suggest chronic rhinosinusitis, aspirin-exacerbated respiratory disease, or cystic fibrosis in children
Investigations
First-line
Clinical diagnosisTypical symptoms and exposure pattern are usually sufficient
Assess asthma and sleep symptomsAsk about wheeze, exercise symptoms, nocturnal cough, snoring, and daytime somnolence
Second-line
Skin-prick or serum specific IgE testingUse if diagnosis is uncertain, symptoms are persistent despite therapy, trigger identification will change management, or immunotherapy is considered
No routine imagingSinus CT is not indicated for uncomplicated allergic rhinitis
Specialist
ENT/allergy referralRefractory symptoms, immunotherapy consideration, nasal polyps, significant anatomic obstruction, recurrent sinusitis, or diagnostic uncertainty
Nasal endoscopyIf unilateral symptoms, epistaxis, suspected polyps, or failure to respond to appropriate therapy
1
Environmental and supportive measures
- Allergen avoidance when a clear trigger is identified; complete avoidance is often unrealistic but targeted measures can help
- Saline nasal irrigation can reduce mucus and improve symptoms as adjunctive therapy
- Avoid smoke and irritant exposure
2
First-line pharmacotherapy
- Intranasal corticosteroid: fluticasone, budesonide, mometasone, or triamcinolone; best for congestion and overall symptom control
- Second-generation oral antihistamine: cetirizine, loratadine, fexofenadine, or levocetirizine for sneezing/itching/rhinorrhea
- Intranasal antihistamine: azelastine or olopatadine; rapid onset and useful for breakthrough symptoms
- Combination intranasal steroid + intranasal antihistamine if monotherapy inadequate
3
Other options
- Leukotriene receptor antagonist such as montelukast is less effective than intranasal steroid; consider with asthma but counsel about neuropsychiatric warning
- Short-course topical decongestant may relieve severe congestion but limit to <=3 days to avoid rhinitis medicamentosa
- Avoid first-generation antihistamines when possible due to sedation and anticholinergic effects
4
Immunotherapy
- Subcutaneous or sublingual allergen immunotherapy for confirmed IgE-mediated disease with persistent symptoms despite medication or desire to reduce long-term medication
- Requires clinically relevant sensitization and monitoring for systemic reactions
Complications
- Asthma worsening: Poor rhinitis control can worsen lower-airway symptoms
- Chronic rhinosinusitis: Persistent obstruction and inflammation can contribute to CRS
- Otitis media/eustachian tube dysfunction: Especially in children
- Sleep impairment: Nasal obstruction can worsen snoring and sleep quality
- Rhinitis medicamentosa: Rebound congestion from prolonged topical decongestant use
USMLE Step 2 CK Exam Tips
- 1Sneezing + itching + clear rhinorrhea + pale boggy turbinates = allergic rhinitis
- 2Intranasal corticosteroids are best first-line therapy for persistent symptoms and congestion
- 3Second-generation antihistamines are preferred; avoid diphenhydramine as routine therapy
- 4Do not order sinus imaging for uncomplicated allergic rhinitis
- 5Allergy testing is not mandatory for straightforward seasonal rhinitis, but useful before immunotherapy
- 6Topical decongestants beyond 3 days can cause rhinitis medicamentosa
- 7Nasal polyps in a child should raise concern for cystic fibrosis
practicetest your knowledge on allergic rhinitisApply what you've learnt with USMLE Step 2 CK-style questions from the iatroX Q-Bank — ent and beyond.
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