Clinical Guides
Allergic Rhinitis
A clinically focused clinical guide to allergic rhinitis across adult, child and pregnancy contexts in India, covering phenotype-led diagnosis, trigger reduction, intranasal treatment, asthma linkage, immunotherapy selection and safety-netting for important mimics.
MedNext Academy | 13 min read
Allergic Rhinitis
A clinically focused clinical guide to allergic rhinitis across adult, child and pregnancy contexts in India, covering phenotype-led diagnosis, trigger reduction, intranasal treatment, asthma linkage, immunotherapy selection and safety-netting for important mimics.
Summary
Allergic rhinitis is an immunoglobulin E-mediated inflammatory disorder of the nasal mucosa after exposure to a relevant allergen. Typical symptoms are sneezing, nasal itching, watery rhinorrhoea and obstruction, often with itchy or watery eyes. Disease may be intermittent or persistent and should be graded by effect on sleep, school or work, daily activity and symptom burden rather than labelled only as seasonal or perennial. In much of India, house-dust mite, cockroach, mould and animal exposure can be perennial, while pollen patterns vary by region and climate.
Diagnosis is usually clinical: a reproducible exposure pattern, characteristic symptoms and compatible nasal examination. Skin-prick or serum allergen-specific IgE testing is useful when the diagnosis is uncertain, a precise trigger would change avoidance advice, or immunotherapy is being considered. Sensitisation alone does not prove that an allergen causes symptoms. Unilateral obstruction, recurrent bleeding, facial swelling, high fever, orbital signs, a foreign body in a child or persistent clear unilateral fluid requires another pathway.
Treatment combines education, targeted trigger reduction, saline irrigation when acceptable and pharmacotherapy matched to severity. Intranasal corticosteroids are generally the most effective single medicine for persistent or obstruction-dominant disease; correct daily technique and adherence matter more than repeated product switching. Second-generation antihistamines help itching, sneezing and rhinorrhoea. Specialist-supervised allergen immunotherapy is reserved for clinically relevant sensitisation with troublesome disease despite optimized measures or a need to reduce long-term medicine burden. Always assess asthma because uncontrolled lower-airway disease changes risk and treatment planning.
How Common Is It?
Allergic rhinitis is common globally and often begins in childhood or early adult life. Published Indian estimates vary widely because studies use different age groups, geographic regions, symptom questionnaires, examination criteria and allergy tests. Urbanisation, indoor allergens, air pollution, occupational exposure and changing pollen seasons may alter symptom patterns, but variability prevents a single percentage from representing every Indian community. A clinic-based sensitisation rate is not population prevalence, and a positive skin test is not equivalent to symptomatic disease.
The burden is frequently underestimated because rhinitis is viewed as a nuisance rather than a chronic airway disorder. Congestion can disrupt sleep, concentration, school attendance, examination performance and workplace productivity. Mouth breathing, snoring, ear symptoms and reduced smell may occur. Children may show frequent sniffing, throat clearing or an upward nasal rub rather than volunteering itch. Adults may normalize long-standing blockage and rely on repeated over-the-counter decongestants. Coexisting allergic conjunctivitis adds impairment, and uncontrolled rhinitis can complicate asthma control.
Symptoms can be intermittent with a pollen season, episodic after animal or occupational contact, or persistent with indoor allergens. Climate and vegetation make pollen calendars local; imported European or North American seasons should not be assumed for India. Apparent increases during pollution episodes may reflect irritant amplification rather than new IgE sensitisation. Severity is defined by the individual's impairment and response, not by the number of allergens detected. Service planning should include primary-care recognition, affordable intranasal medicines, access to validated testing for selected patients and referral capacity for asthma, structural nasal disease and immunotherapy.
Risk Factors
Personal or family atopy increases susceptibility. Ask about asthma, eczema, food allergy and allergic conjunctivitis, as well as parental allergic disease in children. Clinically important exposures include house-dust mite, pollens, moulds, cockroach, animal dander and occupational proteins such as flour, laboratory animals or latex. The relevant allergen depends on timing and location: symptoms on making a bed suggest mite exposure, those during a particular flowering period suggest pollen, and improvement away from work raises an occupational cause. Testing should follow this history rather than use indiscriminate panels.
Indoor dampness, visible mould, inadequate ventilation and pest infestation can increase exposure. Tobacco smoke, incense, mosquito coils, strong fragrances and particulate pollution are usually irritants rather than allergens, but can intensify nasal hyperreactivity and asthma. Advice should distinguish allergen reduction from unrealistic total avoidance. Measures such as removing a pet or undertaking expensive home remediation have major consequences and should be based on a convincing clinical relationship, not sensitisation alone. Single mite-control products rarely provide complete relief when used in isolation.
Infants and young children may develop allergic disease over time, but persistent rhinitis in a very young child still requires consideration of infection, adenoidal disease or a foreign body. Pregnancy-related hormonal congestion can mimic or add to allergic rhinitis. Medicines, including topical decongestants used repeatedly, can cause rhinitis. Occupational risk deserves careful documentation because continued exposure can worsen disease and may coexist with occupational asthma. The major modifiable risks are relevant exposure, smoke and poor adherence or technique; genetics and climate cannot be changed, and counselling should avoid blaming the patient.
Diagnosis
History
Confirm sneezing, itch, watery discharge and blockage; ask about ocular symptoms, smell, sleep, snoring, cough, wheeze and activity impairment. Establish onset, seasonality, place, occupation, animal contact and response when away from the suspected exposure. Clarify frequency, severity, previous medicines and use of over-the-counter decongestant sprays. Thick purulent discharge, fever, prominent facial pain, recurrent epistaxis, unilateral symptoms or neurological features are atypical. In children, ask about mouth breathing, hearing, school performance and witnessed breathing pauses.
Examination
Observe allergic salute, nasal crease, mouth breathing and conjunctivitis. Anterior rhinoscopy may show pale oedematous turbinates and clear secretion, but mucosal colour is not diagnostic. Look for septal deviation, polyps, crust, bleeding, purulence and a foreign body. Examine ears and throat when symptoms suggest effusion or postnasal irritation. Assess the chest and objective asthma control when cough or wheeze is present. Growth and weight matter in children receiving prolonged corticosteroids by multiple routes.
Investigations
Most straightforward cases need no test before a treatment trial. Skin-prick testing or serum specific IgE can confirm sensitisation when results will change avoidance, occupational assessment or immunotherapy. Interpret each result against exposure and symptoms; total IgE and eosinophilia are nonspecific. Nasal endoscopy, sinus imaging and microbiology are not routine for uncomplicated allergy but help investigate structural disease, polyps, chronic rhinosinusitis, bleeding or unilateral findings. Consider peak flow or spirometry for suspected asthma. A supervised nasal allergen challenge is a specialist tool for selected discordant cases, not a routine community test.
Differential Diagnosis
Viral rhinitis usually has a shorter course with systemic or contact symptoms, although repeated infections in children can resemble persistent allergy. Non-allergic rhinitis presents with congestion or rhinorrhoea triggered by temperature, odours, smoke, food or exercise without a convincing IgE pattern; mixed allergic and non-allergic disease is common. Rhinitis medicamentosa follows prolonged topical decongestant use and causes rebound obstruction. Hormonal rhinitis occurs in pregnancy, while medicines such as some antihypertensives can contribute. Local allergic rhinitis is a specialist consideration when systemic tests are negative but nasal allergen responses are demonstrable.
Chronic rhinosinusitis is suggested by persistent obstruction or discharge with facial pressure or reduced smell, supported by endoscopic or imaging evidence when clinically required. Fever and severe focal pain raise an acute infectious complication rather than simple allergy. Nasal polyps, septal deviation, turbinate hypertrophy and adenoidal enlargement cause obstruction. A unilateral foul discharge in a child suggests a foreign body. Recurrent unilateral bleeding, progressive blockage, cranial neuropathy or a neck mass requires exclusion of tumour or other structural pathology.
Watery unilateral rhinorrhoea that increases on bending, particularly after trauma or surgery, can represent cerebrospinal fluid leakage and needs urgent specialist assessment. Gustatory rhinitis follows eating; autonomic rhinorrhoea may occur in older adults. Occupational irritant rhinitis may precede or accompany asthma. Primary ciliary dyskinesia, cystic fibrosis and immune deficiency are uncommon but relevant with chronic infection, poor growth or lower-airway disease. The goal is not to order every test: it is to recognise when the symptom pattern, age, laterality, examination or treatment failure does not fit uncomplicated allergic inflammation.
Management
Begin with shared goals and explain that control, not permanent eradication of atopy, is usually realistic. Teach saline irrigation with sterile, distilled or previously boiled and cooled water; tap water should not be used directly. Targeted exposure reduction may include damp remediation, pest control, washing bedding and avoiding a clearly symptomatic animal or pollen exposure, but burdensome interventions need clinical relevance. Smoke avoidance benefits both nose and lungs. Written instructions and follow-up improve adherence more than an unexplained list of products.
For mild intermittent itch and sneezing, a non-sedating oral or intranasal antihistamine may suffice. Persistent, moderate-to-severe or obstruction-dominant disease generally responds best to a daily intranasal corticosteroid. Benefit takes regular use and may build over days; demonstrate aiming the nozzle away from the septum after gentle clearing. If monotherapy is inadequate despite technique and adherence, an intranasal corticosteroid plus intranasal antihistamine combination has evidence for faster and greater symptom control. Leukotriene receptor antagonists are not preferred first-line rhinitis therapy and carry safety considerations; their role is selective, often when asthma coexists.
Allergen immunotherapy can be subcutaneous or sublingual and is considered by a trained allergy service for documented clinically relevant sensitisation, significant symptoms despite optimized care, or a desire to reduce medicine burden. It requires standardized products, adherence, anaphylaxis precautions and control of asthma. Surgery does not treat IgE inflammation, but ENT procedures may address structural obstruction or selected turbinate disease after medical optimization. Review response, adverse effects, diagnosis and comorbidity before escalating. A repeatedly ineffective regimen is a reason to reassess, not simply to add indefinite medicines.
Prescribing Information
Intranasal corticosteroids such as fluticasone, mometasone or budesonide have low systemic exposure when used correctly, but product labels, age approvals and doses differ. Use the lowest effective licensed dose, inspect for irritation or epistaxis and review technique. Direct the spray laterally, away from the septum. Septal injury is uncommon but avoid spraying onto damaged mucosa. In children needing prolonged treatment, monitor growth within overall care, especially when inhaled or topical corticosteroids are also used. Do not imply that all molecules, devices or combination sprays are interchangeable.
Second-generation oral antihistamines are preferred over sedating first-generation agents for routine use because sedation and impaired performance matter for driving, study and work. Intranasal antihistamines act rapidly and can be combined with intranasal corticosteroid. Topical nasal decongestants may briefly relieve severe blockage but prolonged use risks rebound rhinitis; oral decongestants can cause insomnia, palpitations and blood-pressure effects and are unsuitable for many patients. Montelukast requires individualized risk-benefit discussion because neuropsychiatric adverse effects have been reported.
Pregnancy requires clinician-led selection rather than untreated severe symptoms or unsupervised cessation. Saline and trigger reduction are reasonable foundations. Intranasal corticosteroids and selected second-generation antihistamines have reassuring experience, with budesonide often supported by the largest pregnancy safety dataset, but the current local label and obstetric context must be checked. Avoid routine oral decongestants, particularly early in pregnancy. During breastfeeding, consider infant exposure and sedation. Immunotherapy is generally not initiated during pregnancy; established maintenance may sometimes continue under specialist supervision without dose escalation. This guide supplies safety principles, not patient-specific doses.
When to Refer
Refer to allergy or ENT when diagnosis remains uncertain, symptoms are severe despite an adequate correctly used intranasal regimen, adverse effects prevent treatment, or a patient is considering immunotherapy. Referral is also appropriate for clinically important occupational rhinitis, discordance between symptoms and testing, recurrent sinus disease, polyps, marked septal obstruction, persistent loss of smell or suspected local allergic rhinitis. Document triggers, duration, impairment, medicines tried, technique, adherence, asthma status and any test results; a referral saying only 'allergy' delays useful triage.
Children warrant paediatric or ENT assessment for unilateral foul discharge, recurrent bleeding, suspected foreign body, significant snoring or apnoea, hearing concerns, poor growth, diagnostic uncertainty or persistent obstruction despite treatment. Asthma symptoms, nocturnal cough, exercise limitation or frequent reliever use require lower-airway assessment; urgent respiratory care is needed for acute breathlessness, hypoxia or poor response to reliever therapy. Uncontrolled asthma must be stabilized before allergen immunotherapy because it increases systemic-reaction risk.
Urgent ENT assessment is required for progressive unilateral blockage, recurrent unilateral epistaxis, facial swelling, orbital symptoms, cranial-nerve findings, a suspicious mass or possible cerebrospinal fluid leak. Suspected anaphylaxis after allergen exposure or immunotherapy needs immediate emergency treatment. In India, testing quality and immunotherapy extracts vary, so refer to a service with trained clinicians, standardized allergen products, resuscitation capacity and follow-up. Confirm affordability and travel before proposing a multi-year immunotherapy course. Routine rhinitis can remain in primary care when response and safety are satisfactory.
Red Flags
Allergic rhinitis is usually bilateral or alternating and is not associated with severe systemic illness. Persistent unilateral obstruction, bloody discharge, recurrent unilateral epistaxis, facial numbness, dental symptoms, proptosis, diplopia, reduced vision, severe headache or a neck mass requires structural and malignant causes to be excluded. A unilateral foul-smelling discharge in a child is a foreign body until examined. Clear watery fluid from one nostril after head trauma or sinonasal surgery, especially with a salty taste or postural increase, raises concern for cerebrospinal fluid leakage.
High fever, toxic appearance, severe focal facial pain, frontal swelling, orbital swelling, painful eye movement, visual change, meningism or neurological deficit can indicate complicated sinus infection and needs emergency assessment. Sudden lip or tongue swelling, stridor, wheeze, hypotension or widespread urticaria after an exposure or immunotherapy is anaphylaxis, not routine rhinitis. Follow the local emergency anaphylaxis protocol and do not wait for allergy testing. Acute severe asthma, inability to speak, cyanosis or exhaustion is also an emergency.
Treatment red flags include repeated daily topical decongestant use, troublesome epistaxis, ulceration, marked sedation, behavioural or mood change after montelukast, or growth concern in a child receiving corticosteroids through several routes. These require review, not abrupt discontinuation of essential asthma therapy without advice. Apparent treatment failure is concerning when technique and adherence are good because the diagnosis may be wrong or structural disease may coexist. Pregnancy, infancy and major comorbidity are not emergencies by themselves, but they lower the threshold for supervised medicine selection and follow-up.
Indian Clinical Context
Indian allergen exposure is locally diverse. House-dust mite, cockroach, mould, pollens, animals and occupational agents may be relevant, while pollen seasons vary with altitude, vegetation, monsoon and urban planting. Imported calendars and broad commercial panels can therefore mislead. Pollution, biomass smoke, incense and mosquito-coil smoke commonly exacerbate nasal and lower-airway symptoms but are usually irritants rather than proof of IgE allergy. History-led testing prevents expensive sensitisation results from being mistaken for disease causation.
Access ranges from primary care and ENT clinics to specialist allergy centres. Skin-prick testing requires valid extracts, controls, trained interpretation and management of rare systemic reactions. Serum specific IgE may be more feasible when antihistamines cannot be stopped or skin testing is unsuitable, but cost and limited panels matter. Immunotherapy should use standardized products with documented composition and a service able to manage anaphylaxis. Unlabelled mixtures, remote prescribing without diagnostic correlation and promises of permanent cure are unsafe.
Affordability and device availability influence adherence. Demonstrating one accessible intranasal product well may outperform repeated costly switching. Provide language-appropriate written technique, discuss school or workplace exposure and ask directly about asthma medicines. Pregnancy and childhood dosing must follow Indian product labels and clinician review rather than assumptions from adult international guidance. Regional referral options should be documented. Evidence from international guidelines is transferable for core principles, but India-specific prevalence, pollen timing, licensed preparations and reimbursement require local verification. Where evidence is weak, state uncertainty rather than converting expert practice into a national rule.
NMC Competency Mapping
Allergic rhinitis maps directly to NMC ENT competency EN4.27: eliciting, documenting and presenting a correct history; demonstrating and describing clinical features; choosing investigations; and describing management principles. A learner should elicit sneeze, itch, rhinorrhoea, obstruction, ocular symptoms, timing and exposure; grade sleep and activity impairment; and ask about asthma. Under supervision, the learner should perform external nasal examination and anterior rhinoscopy, recognise turbinate oedema, secretion, septal deviation, polyps, bleeding and a foreign body, while understanding that pale mucosa alone does not prove allergy.
Clinical reasoning requires separation from viral and non-allergic rhinitis, rhinitis medicamentosa, chronic rhinosinusitis, adenoidal disease, pregnancy rhinitis and dangerous unilateral pathology. Students should explain when skin-prick or serum specific IgE testing adds value and why sensitisation must match symptoms. They should assess the lower airway and understand the linked-airway relationship with asthma. Nasal endoscopy and allergy challenge require appropriately trained supervision; this text does not certify those procedures.
Therapeutic competence includes explaining targeted avoidance, saline safety, intranasal corticosteroid technique, non-sedating antihistamines, decongestant limitations and indications for specialist immunotherapy. Communication skills include child and caregiver education, pregnancy-safe shared decisions, occupational implications, adherence and safety-netting. Exact sign-off must use the current institutional NMC logbook because teaching assignments can vary. The expected outcome is a safe first assessment and appropriate referral, not independent initiation of allergen immunotherapy or management of anaphylaxis without supervised clinical training.
Key Exam Pearls for NEET PG
Allergic rhinitis is a type I, IgE-mediated hypersensitivity disorder. Allergen cross-linking of mast-cell-bound IgE releases histamine and other mediators, producing an early response of sneezing, itch and rhinorrhoea; later eosinophilic inflammation contributes to congestion and hyperreactivity. Symptoms are classically sneezing, nasal pruritus, watery rhinorrhoea and obstruction with or without allergic conjunctivitis. Allergic salute, transverse nasal crease and turbinate oedema are supportive findings, not pathognomonic signs.
Classify by intermittent or persistent frequency and by mild versus moderate-to-severe impairment. Intranasal corticosteroids are the most effective single class for persistent and blockage-dominant disease. Second-generation antihistamines improve itch, sneeze and rhinorrhoea with less sedation than first-generation agents. Combined intranasal corticosteroid and intranasal antihistamine can outperform either alone when correctly used. Prolonged topical decongestant use causes rhinitis medicamentosa. Montelukast is not preferred over intranasal corticosteroid and requires neuropsychiatric safety awareness.
A positive skin test or serum specific IgE demonstrates sensitisation, not necessarily clinical allergy; it must fit exposure-linked symptoms. Immunotherapy needs relevant sensitisation, significant disease and specialist safety infrastructure. Uncontrolled asthma increases immunotherapy risk. Remember dangerous alternatives: a unilateral foul discharge in a child suggests foreign body; persistent unilateral bleeding or blockage needs tumour exclusion; clear post-traumatic unilateral rhinorrhoea may be cerebrospinal fluid. In pregnancy, start with non-drug measures and clinician-selected medicines; do not initiate immunotherapy or use oral decongestants routinely.
Frequently Asked Questions
Is a positive allergy test enough to diagnose allergic rhinitis?
No. Skin-prick or serum specific IgE testing shows sensitisation. The allergen must also fit the timing, place and exposure pattern of symptoms. Testing is most useful when it clarifies an uncertain diagnosis, guides a realistic avoidance plan, evaluates occupational disease or supports specialist immunotherapy selection.
Why is an intranasal corticosteroid often preferred for persistent blockage?
It treats the underlying nasal inflammation and generally controls congestion better than an oral antihistamine. Regular use and correct lateral spray technique are essential, and improvement may build over several days. Persistent bleeding, irritation, poor response or use in a young child should prompt technique and diagnosis review.
When should allergen immunotherapy be considered for rhinitis?
A trained allergy service may consider it when a clinically relevant allergen is confirmed and substantial symptoms persist despite optimized avoidance and medicines, or when reducing long-term medicine burden is an important goal. It requires standardized products, adherence, emergency capability and well-controlled asthma; it is not a guaranteed cure.
How should allergic rhinitis be approached during pregnancy?
Confirm that allergy rather than hormonal or another cause explains symptoms. Saline and practical trigger reduction are foundations. A clinician can select an intranasal corticosteroid or non-sedating antihistamine with reassuring pregnancy experience when needed. Avoid unsupervised oral decongestants, and do not initiate allergen immunotherapy during pregnancy.
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