Introduction
Allergic rhinitis—often called hay fever—is inflammation of the nasal lining triggered by allergens. The immune system releases histamine and related mediators, causing sneezing, runny or blocked nose, itching, and often itchy watery eyes.
It may be seasonal (commonly pollen-driven) or perennial (year-round from dust mites, pets, moulds, or other indoor allergens). Many people also have allergic conjunctivitis, sinus pressure, sleep disturbance, or coexisting asthma.
Although not usually dangerous, poorly controlled rhinitis lowers quality of life, worsens asthma control, and leads to repeated sinus or ear problems in some patients. Identifying triggers and using stepwise treatment brings reliable relief for most people.
Management includes allergen reduction, antihistamines, nasal corticosteroid sprays, and—for persistent severe disease—immunotherapy. This page is educational; persistent or severe symptoms deserve a clinical review.
Overview
Allergic rhinitis is IgE-mediated inflammation of the nose (and often eyes) after allergen exposure, presenting as seasonal or perennial symptoms.
Diagnosis is mainly clinical, supported by skin-prick testing or serum specific IgE when the trigger pattern is unclear or immunotherapy is considered.
Treatment combines avoidance measures, pharmacotherapy, and immunotherapy for selected moderate–severe cases.
- Commonly known as hay fever; driven by histamine and allergic inflammation
- Seasonal or perennial patterns depending on the allergen
- Hallmarks: sneezing, itchy/runny/blocked nose, itchy watery eyes
- Pollens are frequent seasonal triggers; mites, pets, and moulds drive many perennial cases
- Skin-prick and RAST/specific IgE blood tests help confirm sensitisation
- Antihistamines, nasal sprays, and immunotherapy are mainstays of care
What happens in the body
After sensitisation, re-exposure to allergen cross-links IgE on mast cells in the nasal mucosa. Histamine and other mediators produce immediate itching, sneezing, and watery discharge; a delayed inflammatory phase sustains blockage and hyper-reactivity.
The “unified airway” links nose and bronchi: uncontrolled rhinitis can amplify asthma symptoms. Chronic mouth breathing and sleep fragmentation follow when congestion is severe.
- Type I hypersensitivity in nasal (and often conjunctival) mucosa
- Histamine drives itch, sneeze, and rhinorrhoea
- Late-phase inflammation prolongs obstruction
- Seasonal pollens versus perennial indoor allergens shape the calendar of symptoms
- Comorbid asthma and sinus disease are common
Signs and symptoms
The most common symptoms of allergic rhinitis include:
- Frequent or paroxysmal sneezing
- Runny, itchy, or stuffy nose
- Itchy, watery eyes
- Coughing from post-nasal drip
- Sore throat or throat clearing
- Headaches or facial pressure
- Dark circles under the eyes
- Dry or itchy skin in some atopic individuals
- Excessive fatigue from poor sleep and persistent symptoms
Causes and risk factors
Symptoms follow exposure to allergens that provoke IgE-mediated inflammation. Common triggers and risk factors:
- Tree, grass, or weed pollens—often seasonal and geographically specific
- House-dust mites in bedding, carpets, and upholstery
- Animal dander from cats, dogs, or other pets
- Mould spores in damp indoor or outdoor environments
- Cockroach allergen in some homes
- Personal or family history of atopy (asthma, eczema, prior allergies)
- Occupational aeroallergens in selected workplaces
- Smoke and pollution that irritate already inflamed mucosa
Diagnosis and evaluation
Mild clear-cut cases may be managed after clinical assessment; testing refines care when needed:
- History of timing, seasonality, exposures, and response to previous medicines
- Examination of the nose, eyes, throat, and chest; look for comorbid asthma
- Skin-prick testing: allergen introduced into the skin and checked for a local allergic wheal
- Blood testing such as RAST/specific IgE to measure allergen-directed antibody
- Trial of guideline-based therapy as a practical diagnostic support in typical cases
- Consider non-allergic rhinitis, chronic sinusitis, or structural blockage when tests are negative or response is poor
Treatment and management
Treatment is stepped to symptom severity and should be discussed with a clinician—especially if you take other medicines or have other conditions:
- Oral or intranasal antihistamines to block histamine-driven itch, sneeze, and rhinorrhoea
- Intranasal corticosteroid sprays as highly effective controllers for congestion and inflammation
- Decongestants for short-term relief of stuffiness—only with medical advice if you have high blood pressure, prostate/urinary disease, or other contraindications
- Eye drops and nasal sprays for temporary itch relief; many are intended for short courses unless a clinician directs otherwise
- Saline irrigation as a gentle adjunct to clear allergens and mucus
- Allergen immunotherapy (allergy shots or other supervised forms) for moderate–severe or persistent disease to reduce long-term sensitivity
- Asthma medicines adjusted if lower-airway disease coexists
- Avoid starting multiple overlapping sedating antihistamines or long-term topical decongestants without guidance
Prevention, self-care, and lifestyle
Not every condition is fully preventable, but the steps below may lower risk or recurrence:
- Track pollen counts and limit peak outdoor exposure when seasonal allergy is known
- Use mite-proof covers, wash bedding hot, and reduce indoor dust reservoirs when mite-allergic
- Address dampness and mould; consider pet-allergen strategies if dander is confirmed
- Keep windows closed during high pollen periods; use filtration where helpful
- Shower and change clothes after heavy outdoor allergen exposure
- Start preventive nasal sprays before your usual bad season if advised
- Do not smoke; avoid second-hand smoke and strong irritants
Possible complications
Delay, missed care, or unsafe self-medication can raise the chance of complications in some cases:
- Chronic nasal obstruction and mouth breathing
- Sinusitis and recurrent ear complaints in some patients
- Sleep disruption, daytime sleepiness, and reduced concentration
- Worsening of coexisting asthma
- Impaired school or work performance and quality of life
- Side effects from overused oral decongestants or sedating antihistamines
- Rarely, medication rhinitis from prolonged topical decongestant use
When to see a doctor or seek emergency care
Seek prompt medical advice or emergency care if any of the following apply—it is safer not to wait and see:
- Symptoms lasting weeks or disrupting sleep, school, or work despite simple measures
- Wheeze, chest tightness, or known asthma getting harder to control
- Facial swelling, severe difficulty breathing, or signs of anaphylaxis—seek emergency care
- Need for frequent decongestants or repeated antibiotic courses for “sinus” symptoms
- Unilateral blockage, bloody discharge, or marked pain atypical for simple allergy
- Interest in immunotherapy or unclear triggers despite careful history
Living with the condition
Consistent daily control—especially nasal steroid technique and timing—usually beats waiting for severe days. Pair medicine with practical allergen reduction rather than relying on either alone.
People with both rhinitis and asthma should treat the nose actively; better upper-airway control often steadies the chest. Keep a simple symptom diary through one high-pollen season to refine prevention.
Review the plan if you become pregnant, develop new chronic disease, or start medicines that interact with decongestants or sedating antihistamines.
Frequently asked questions
What is allergic rhinitis?
It is allergen-triggered inflammation of the nasal lining—commonly called hay fever—driven by histamine and related immune mediators.
What usually causes it?
Pollens often drive seasonal disease; dust mites, pets, moulds, and similar indoor allergens drive many perennial cases.
How is it diagnosed?
Clinical history is central; skin-prick testing or specific IgE blood tests help confirm relevant sensitisations.
What treatments work best?
Antihistamines and intranasal corticosteroid sprays help most people; immunotherapy is an option for persistent moderate–severe allergy.
Are decongestants safe for everyone?
No. People with high blood pressure or certain urinary conditions should use them only after medical advice, and topical decongestants should not be overused.
Can it affect asthma?
Yes. Untreated allergic rhinitis often worsens asthma control because the nose and lungs are linked airways.
Important caution
This article is for general health education only. It is not personal medical advice or a prescription.
Medicine choices—especially decongestants, steroids, and immunotherapy—should be guided by a qualified clinician.
Seek urgent care for severe breathing difficulty, facial swelling, or suspected anaphylaxis.