IgE-mediated nasal mucosal inflammation from inhaled allergens, producing congestion, rhinorrhea, sneezing, and itch.
Also known as: allergic rhinitis, hay fever, seasonal allergies, perennial rhinitis
Overview
IgE-mediated inflammation of the nasal mucosa triggered by inhalation of environmental allergens. Classified by pattern (seasonal vs perennial), frequency (intermittent vs persistent), and severity (mild vs moderate-severe).
Epidemiology
Affects 10-30% of US adults and up to 40% of children. Often coexists with asthma, atopic dermatitis, and food allergy ('atopic march'). Onset usually in childhood or adolescence; can persist or develop in adults.
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Question 1EENTMedium
A 24-year-old woman reports 3 years of recurrent springtime sneezing fits, clear watery rhinorrhea, and itching of the nose and eyes. Symptoms recur every April and resolve by July. On exam she has pale, boggy nasal turbinates with clear discharge and dark infraorbital circles. She wants to know precisely which allergens she should avoid and is considering immunotherapy. Which of the following is the most appropriate next diagnostic test to identify her specific triggers?
APeripheral eosinophil count
BAllergen-specific serum IgG panel
CEpicutaneous patch testing
DAllergen skin prick testing
ESerum total IgE blood level
Reveal answer & full explanation
Correct answer: D — Allergen skin prick testing
APeripheral eosinophil count
BAllergen-specific serum IgG panel
CEpicutaneous patch testing
DAllergen skin prick testing✓
ESerum total IgE blood level
Why Allergen skin prick testing is correct
Skin prick testing is a sensitive, rapid way to identify the specific environmental allergens driving IgE-mediated allergic rhinitis, which is exactly what this patient needs before allergen-avoidance counseling and immunotherapy.
It is the preferred first-line allergen-identification study because it is inexpensive and read within 15-20 minutes. Oral antihistamines must be held for about 5-7 days beforehand, and dermatographism or extensive eczema would favor allergen-specific serum IgE instead.
Why the others are wrong
Serum total IgE blood level - a total IgE is nonspecific; it neither identifies which allergens the patient reacts to nor is routinely needed. Allergen-specific serum IgE (ImmunoCAP) is the usual alternative when skin testing is not feasible.
Epicutaneous patch testing - patch testing detects delayed (type IV) T-cell-mediated sensitization and is used to evaluate allergic contact dermatitis; it does not detect the immediate IgE-mediated (type I) sensitization to pollens that drives seasonal allergic rhinitis.
Peripheral eosinophil count - eosinophilia is a nonspecific marker of atopy and does not pinpoint individual triggers, so it cannot guide avoidance or immunotherapy selection.
Allergen-specific serum IgG panel - a panel of antibodies to specific allergens sounds like it should pinpoint triggers, but allergen-specific IgG (including IgG4) reflects exposure or developing tolerance rather than IgE-mediated sensitization, and allergy societies advise against using it to diagnose allergy; the blood test that does identify triggers is allergen-specific IgE.
Question 2EENTMedium
A 9-year-old boy is brought to the clinic for several months of sneezing fits, clear watery rhinorrhea, and itchy, watery eyes that worsen each spring. Exam shows pale, boggy nasal turbinates, dark circles beneath both eyes, and a transverse crease across the lower nose. He has a history of eczema, and his mother has asthma. He lives with his parents, both corporate attorneys, in a high-rise apartment in a large city. Of the features in this child's history, which of the following is the strongest risk factor for his condition?
AHigher household socioeconomic status
BMale sex in the prepubertal school years
CLiving in a densely populated urban area
DSeasonal exposure to tree pollen
EPersonal and family history of atopy
Reveal answer & full explanation
Correct answer: E — Personal and family history of atopy
AHigher household socioeconomic status
BMale sex in the prepubertal school years
CLiving in a densely populated urban area
DSeasonal exposure to tree pollen
EPersonal and family history of atopy✓
Why Personal and family history of atopy is correct
Allergic rhinitis is the IgE-mediated arm of the atopic march, and a personal or family history of atopic disease (asthma, eczema, food allergy) is the single strongest predictor, carrying the highest relative risk.
This child already has eczema and a mother with asthma, placing him squarely in the atopic phenotype that drives Th2-skewed IgE production.
Why the others are wrong
Male sex in the prepubertal school years - boys have a modestly higher prevalence of allergic rhinitis than girls before puberty (the sex ratio evens out or reverses after adolescence), but this is a weak demographic association compared with the atopic predisposition this child already shows.
Higher household socioeconomic status - his parents' professional careers place the household at higher socioeconomic status, which is linked to allergic rhinitis through the hygiene hypothesis, but the association is weak and indirect compared with a family and personal history of atopy.
Living in a densely populated urban area - his city upbringing is associated with higher rates than rural or farm living (early farm exposure is protective), yet it is a modest environmental contributor, not the dominant driver.
Seasonal exposure to tree pollen - the spring worsening shows that tree pollen triggers his symptoms, but nearly everyone is exposed to seasonal pollen; exposure provokes allergic rhinitis only in a child already predisposed to IgE sensitization, so it is the trigger rather than the underlying risk factor.
Additional high-yield points
Spring-predominant symptoms point to tree pollen sensitization; perennial indoor allergens such as dust mites cause year-round symptoms.
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Personal or family history of atopy (asthma, eczema, food allergy)
Early-life exposure to allergens (dust mites, pets, pollen, cockroach, mold)
Maternal smoking, urban environment
Higher socioeconomic status (hygiene hypothesis association)
Pathophysiology
First exposure: APCs present allergen → Th2 differentiation → IL-4/IL-13 drive B-cell IgE production → IgE binds mast cells. Re-exposure: allergen crosslinks IgE on mast cells → degranulation with histamine, tryptase, leukotrienes → early-phase sneezing, itch, rhinorrhea (minutes). Late-phase 4-8 h later: eosinophil and Th2 infiltrate → congestion and hyperresponsiveness.
Clinical presentation
Symptoms
Sneezing, especially in paroxysms
Clear watery rhinorrhea
Nasal congestion / obstruction (often the most bothersome)
Itching of nose, eyes, palate, ears
Postnasal drip with throat clearing or chronic cough
Decreased smell/taste; sleep disturbance
Signs / physical exam
Allergic shiners — dark infraorbital circles from venous stasis
Dennie-Morgan lines — infraorbital folds
Allergic salute (transverse nasal crease in children)
Pale, bluish, boggy turbinates with clear discharge
Cobblestoning of posterior oropharynx
Conjunctival injection, tearing if concurrent allergic conjunctivitis
Classic findings
Pale boggy turbinates with clear watery rhinorrhea plus allergic shiners and a transverse nasal crease in an atopic child.
Differential diagnosis
Viral rhinitis (common cold) — Acute onset, self-limited 7-10 days, sore throat/cough, no itching, no triggers; supportive care
Nonallergic rhinitis (vasomotor) — Triggered by odors, temperature changes, foods; no itching, negative allergy testing; intranasal steroid or ipratropium
Acute bacterial sinusitis — Symptoms >10 days or worsening after initial improvement, facial pain/pressure, purulent discharge, fever
Rhinitis medicamentosa — Rebound congestion from prolonged topical decongestant (oxymetazoline) use >3-5 days; taper and replace with intranasal steroid
Nasal polyps — Persistent obstruction, anosmia, asthma + aspirin sensitivity (Samter triad); pale gray grape-like masses on rhinoscopy
Deviated septum / structural — Unilateral fixed obstruction, no allergic features
Foreign body (children) — Unilateral foul purulent discharge in a young child; remove
CSF rhinorrhea — Unilateral clear watery discharge after trauma or surgery; halo sign, beta-2 transferrin positive
Diagnostic workup
Diagnostic criteria
ARIA: based on temporal pattern (intermittent <4 days/week or <4 weeks; persistent ≥4 days/week AND ≥4 weeks) and severity (mild = normal sleep/activities; moderate-severe = impaired sleep, school/work, or troublesome symptoms).
Labs
Clinical diagnosis in most cases — history of trigger-related symptoms with characteristic findings
Skin prick testing (allergist) — most sensitive; identifies specific allergens; antihistamines must be held 5-7 days prior
Serum specific IgE (ImmunoCAP) — when skin testing not feasible (severe eczema, antihistamine dependence, dermatographism)
Total IgE and eosinophil count are nonspecific and not routinely needed
Imaging
Not required for typical allergic rhinitis
Nasal endoscopy if structural disease (polyps, deviated septum) or chronic sinusitis suspected
CT sinus only if complicating rhinosinusitis
Diagnostic algorithm
Severity / Pattern
Step Therapy
Mild intermittent
Oral 2nd-gen antihistamine PRN OR intranasal antihistamine
Moderate-severe intermittent
Intranasal corticosteroid alone (adding an oral antihistamine gives no extra benefit); INCS + intranasal antihistamine is an option
Mild persistent
Intranasal corticosteroid daily
Moderate-severe persistent
Intranasal corticosteroid + intranasal antihistamine; reassess in 2-4 weeks
Stepwise management of allergic rhinitis by severity and persistence (ARIA framework).
Treatment
First-line
Allergen avoidance: dust mite-impermeable bedding covers, HEPA filters, pet dander reduction, pollen avoidance and showering after exposure
Intranasal corticosteroid — fluticasone propionate/furoate, mometasone, budesonide, or triamcinolone — most effective single agent for moderate-severe or persistent symptoms; takes days for full effect, weeks for peak
Second-generation oral H1 antihistamine — loratadine, cetirizine, fexofenadine, or levocetirizine — first-line for mild/intermittent symptoms
Intranasal antihistamine — azelastine or olopatadine — fast onset (minutes); can replace or add to oral agents
Saline nasal irrigation (neti pot, sinus rinse) as adjunct
Second-line / adjunct
Combination intranasal corticosteroid + intranasal antihistamine (fluticasone/azelastine) for moderate-severe symptoms
Leukotriene receptor antagonist — montelukast — particularly if concurrent asthma; FDA boxed warning for neuropsychiatric effects
Short course oral corticosteroids only for severe refractory exacerbations
Topical decongestant — oxymetazoline — for short-term congestion (≤5 days) to avoid rhinitis medicamentosa
Allergen immunotherapy — subcutaneous (SCIT) or sublingual (SLIT, e.g., grass, ragweed, dust mite tablets) — disease-modifying; consider for inadequate response, side effects to medications, or desire to reduce medication burden
Complications
Sleep disturbance with daytime fatigue and impaired school/work performance
Acute and chronic rhinosinusitis
Otitis media with effusion in children
Asthma exacerbations (unified airway)
Nasal polyposis with chronic disease
PANCE pearls
Intranasal corticosteroids outperform oral antihistamines for nasal congestion and overall symptom control.
First-generation antihistamines (diphenhydramine, chlorpheniramine) cause sedation and cognitive impairment — avoid as first-line; especially avoid in elderly (Beers criteria).
Oxymetazoline use >5 days causes rhinitis medicamentosa — treat by stopping the topical, replacing with intranasal steroid, and counseling.
Allergic rhinitis plus asthma — treating the upper airway improves lower-airway control.
Unilateral nasal obstruction, epistaxis, or anosmia is NOT classic allergic rhinitis — evaluate for polyp, tumor, or foreign body.
References
JTFPP (AAAAI/ACAAI) 2020 — Dykewicz MS, Wallace DV, Amrol DJ, et al. Rhinitis 2020: A practice parameter update. J Allergy Clin Immunol 2020;146(4):721-767
ARIA 2020 — Bousquet J, Schünemann HJ, Togias A, et al. Next-generation Allergic Rhinitis and Its Impact on Asthma (ARIA) guidelines for allergic rhinitis based on Grading of Recommendations Assessment, Development and Evaluation (GRADE) and real-world evidence. J Allergy Clin Immunol 2020;145(1):70-80.e3
AAO-HNS 2015 — Seidman MD et al. Clinical Practice Guideline: Allergic Rhinitis. Otolaryngol Head Neck Surg 2015;152(1S):S1-S43
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