Allergic rhinitis is an immune-mediated inflammation of the nasal lining triggered by airborne allergens — and in Ahmedabad, the combination of year-round dust, seasonal pollen, vehicle exhaust, and high indoor mould exposure during monsoon makes it one of the most persistent and undertreated ENT conditions in the city. It is not a cold that keeps coming back. It is not simply a sensitivity to weather. It is a specific immune response — driven by IgE antibodies reacting to identifiable allergens — that produces sneezing, itching, nasal congestion, and watery eyes every time the trigger is encountered. Dr Mihir Mehta at Aashwi ENT Hospital, Bodakdev, Ahmedabad sees allergic rhinitis cases across all severity levels, and the most important thing he tells new patients is this: controlling it begins with knowing exactly what you are reacting to.
Allergic Rhinitis: What Is Triggering Your Sneezing and How to Actually Control It
What Is Actually Happening in the Nose
When an allergen — dust mite protein, pollen grain, fungal spore, animal dander — enters the nasal passage of a sensitised person, IgE antibodies on the surface of mast cells in the nasal lining recognise it. Within seconds, those mast cells release histamine and other inflammatory mediators. Histamine binds to receptors in the nasal blood vessels and nerve endings, producing the immediate response: sneezing, itching, watery discharge, and blood vessel swelling that narrows the nasal airway.
This is the early phase — occurring within minutes of exposure. Four to eight hours later, a late-phase response adds a second wave of inflammation involving eosinophils and cytokines that sustains congestion and mucosal thickening long after the initial allergen has been cleared. This late phase is why antihistamines — which block the early histamine response — often do not fully control allergic rhinitis symptoms. The congestion that persists hours later is driven by a different inflammatory mechanism that antihistamines do not target.
Understanding this two-phase biology is what explains why intranasal corticosteroid sprays, which suppress both phases, are more effective as daily maintenance than antihistamines taken as needed.
The Specific Allergens Driving Rhinitis in Ahmedabad
Ahmedabad’s allergen profile is specific — and knowing what is prevalent here matters for understanding your own triggers.
- House dust mites are the most common year-round allergen globally, and Ahmedabad’s warm, humid conditions during and after the monsoon are ideal for their proliferation. They live in mattresses, pillows, upholstered furniture, and carpets. Symptoms are worst in the morning — when the person has spent eight hours close to the highest concentration of mite allergen — and improve when they leave the house.
- Pollen in Ahmedabad peaks during two windows: the post-monsoon flowering season from September to November, and spring months from February to April. Prosopis juliflora — the invasive mesquite tree planted widely across Gujarat — is one of the most potent sensitizers in the region and drives significant pollen rhinitis in adults who have lived in Ahmedabad for years.
- Fungal spores surge during and immediately after the monsoon when indoor and outdoor mould growth peaks. Alternaria and Aspergillus are the most clinically relevant fungal allergens in the city. People with mould allergy experience their worst rhinitis symptoms in July through September.
- Cockroach allergen — particularly relevant in older residential buildings and dense urban areas — is a year-round sensitiser that often goes unidentified because patients do not connect insect exposure to nasal symptoms.
- Vehicle exhaust and PM2.5 are not allergens in the classical sense — they do not trigger IgE responses — but they act as adjuvants that lower the threshold for allergen reactivity. In practice, this means a person with mild dust mite allergy who moves near a busy road often experiences worsened rhinitis dramatically without any change in their allergen exposure — because pollution amplifies the immune response to everything else they are already sensitised to.
Seasonal vs Perennial — Why the Distinction Matters for Treatment
Allergic rhinitis is classified as seasonal or perennial, and this classification directly affects how it is managed.
- Seasonal allergic rhinitis — hay fever — produces symptoms that follow a clear calendar pattern. Worse during specific months and relatively clear during others. Pollen is almost always the driver. In Ahmedabad, this pattern peaks post-monsoon and in early spring.
- Perennial allergic rhinitis produces symptoms year-round with no clear seasonal variation. House dust mites, cockroach allergen, pet dander, and mould are the usual drivers. Symptoms may fluctuate — worse in monsoon for mould-sensitised patients, worse in winter when houses are sealed — but never fully clear between periods.
Many patients in Ahmedabad have mixed sensitisation — reacting to both pollen (seasonal) and dust mites (perennial) — which means they have a seasonal baseline that flares further during pollen season. This overlap is why allergy testing that identifies all sensitisations, rather than assuming a single trigger, is the most useful diagnostic step.
Practical Control Strategies That Actually Work
Managing allergic rhinitis is a combination of reducing allergen exposure, suppressing the immune response pharmacologically, and in appropriate patients, desensitising the immune system over time.
Reducing exposure to house dust mites:
- Encase mattress and pillows in allergen-proof covers — the most effective single intervention for dust mite allergy
- Wash bedlinen weekly in water above 60°C — below this temperature, mites survive the wash cycle
- Remove heavy curtains and carpets from the bedroom if possible
- Keep bedroom humidity below 50 percent — dehumidification inhibits mite reproduction
Managing mould exposure during monsoon:
- Use an exhaust fan in bathrooms after showering — residual moisture supports Alternaria growth on grout and wall surfaces
- Check for and treat any water seepage or damp patches in walls before monsoon season
- Avoid leaving wet clothes or shoes inside the living space
Controlling pollen exposure during peak season:
- Keep windows closed during peak pollen hours — early morning in Ahmedabad, when pollen concentration in air is highest
- Shower and change clothes after extended outdoor activity during pollen season
- Wear wraparound sunglasses outdoors — they reduce the volume of airborne allergen reaching the eyes
Pharmacological control:
- Intranasal corticosteroid sprays — the most effective class of medication for allergic rhinitis. Suppresses both the early and late-phase inflammatory response. Must be used daily for two to four weeks before full effect is apparent — not taken as needed.
- Non-sedating antihistamines — cetirizine, loratadine, or fexofenadine — reduce itching, sneezing, and watery eyes effectively but have limited effect on nasal congestion driven by the late-phase response.
- Saline nasal rinse daily — physically flushes allergens from the nasal passage before they can trigger the IgE response. Performed consistently, it reduces the daily allergen load significantly.
- Leukotriene receptor antagonists — montelukast — useful when rhinitis accompanies asthma or when nasal congestion is the dominant symptom.
Immunotherapy — the only disease-modifying treatment: Allergen immunotherapy — delivered as subcutaneous injections or sublingual drops — gradually desensitises the immune system to specific allergens over one to three years. It is the only treatment that changes the underlying allergic tendency rather than controlling its symptoms. Appropriate for patients with confirmed allergen sensitisation on allergy testing whose symptoms are not adequately controlled with standard medication, or who want to reduce long-term medication dependence. Dr Mihir Mehta assesses immunotherapy candidacy as part of the ENT allergy evaluation at Aashwi ENT Hospital.
Frequently Asked Questions
Is allergic rhinitis the same as hay fever?
Hay fever specifically refers to pollen-triggered seasonal allergic rhinitis — the term originates from the grass-cutting season in temperate climates when pollen was highest. Allergic rhinitis is the broader medical term covering all IgE-mediated nasal inflammation from any allergen, including dust mites, mould, and animal dander. In Ahmedabad, most patients with “hay fever” are actually reacting to both pollen and year-round allergens — making perennial rhinitis more accurate as a diagnosis than purely seasonal hay fever.
Can allergic rhinitis develop in adulthood with no previous allergy history?
Yes. Adult-onset allergic rhinitis is common. New sensitisation can develop at any age following sustained exposure to a new allergen — moving to a city with different pollen, getting a pet, moving into a property with high dust mite load, or beginning a job with occupational allergen exposure. Adults in Ahmedabad who relocated from smaller towns often develop house dust mite and Prosopis pollen sensitisation within two to three years of moving.
Why do antihistamines stop working after a few weeks?
Antihistamines do not lose efficacy through true tolerance — the receptor mechanism remains responsive. What changes is the nature of the symptom burden. As allergen exposure continues, the late-phase inflammatory response — not blocked by antihistamines — becomes the dominant symptom driver, making sneezing and itching less prominent while congestion becomes more persistent. Switching to or adding an intranasal corticosteroid spray addresses this late-phase component and typically restores adequate symptom control.
Does eating certain foods make allergic rhinitis worse?
Oral allergy syndrome — cross-reactivity between pollen allergens and certain raw fruits and vegetables — can cause itching and swelling in the mouth and throat after eating specific foods during pollen season. Prosopis pollen-sensitised patients sometimes react to raw mangoes. This is not a true food allergy — it is a cross-reactive immune response. Cooking the food typically eliminates the reactivity. It does not worsen nasal rhinitis directly, but it signals broad sensitisation worth investigating.
How long does it take for intranasal steroid sprays to work?
The anti-inflammatory effect of intranasal corticosteroid sprays builds gradually. Some improvement in nasal congestion typically appears within 48 to 72 hours. Full effect on all symptoms takes two to four weeks of consistent daily use. Most patients abandon sprays within one week because they expect immediate relief similar to a decongestant. The spray is a maintenance treatment — not a rescue medication — and works best when used before allergen exposure begins, not during a peak flare.
When should I see Dr Mihir Mehta for allergic rhinitis?
When symptoms are present on most days and affecting sleep, work, or quality of life. When over-the-counter antihistamines no longer provide adequate control. When rhinitis is accompanied by recurrent sinus infections, nasal polyps, or hearing changes from Eustachian tube involvement. When you want allergy testing to identify your specific triggers before committing to long-term medication. A nose examination at Aashwi ENT Hospital determines whether nasal structural changes have developed alongside the allergy—and whether treatment beyond medication is needed.
Knowing Your Trigger Is Half the Treatment
Most people with allergic rhinitis manage their symptoms with the wrong medication for the wrong allergen — because they have never been tested. Taking an antihistamine for a dust mite allergy while sleeping on an unencased mattress treats the immune response while the trigger continues uninterrupted.
Dr Mihir Mehta at Aashwi ENT Hospital, Bodakdev, Ahmedabad provides allergy evaluation, nose examination, and immunotherapy assessment in a single appointment. The diagnosis tells you exactly what you are reacting to—and that knowledge is what makes every control strategy that follows work.
Book your allergy evaluation today.
Aashwi ENT Hospital — 25, Sumangalam Co-op Housing Society, Drive-In Road, opp. Sunset Drive Cinema, Bodakdev, Ahmedabad – 380054 
+91 997 989 1672 
Dr Mihir K. Mehta — MBBS, DLO, MS-ENT | 23+ Years ENT Experience
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Dr Mihir Mehta, Satellite, Ahmedabad | Top ENT, Throat, Nose, Sleep Apnea Doctor, Specialist