A stuffy nose in the middle of spring, endless sneezing, and itchy eyes for three weeks. Is it a lingering cold or a seasonal allergy? Confusion between the two is common, and it's not trivial: the treatment for a viral cold and that for allergic rhinitis are different, and using the wrong one for weeks unnecessarily delays relief.
Seasonal allergic rhinitis is an immune system reaction to airborne pollens. It cannot be cured, but it can be managed very well with the right tools.
How to distinguish between allergic rhinitis and a common cold
Several clues allow us to distinguish between them. A cold is caused by a virus and usually lasts seven to ten days. Symptoms set in gradually, often starting with a sore throat, followed by congestion and a runny nose. A slight fever and muscle aches are possible with a cold but absent in allergic rhinitis.
Allergic rhinitis, on the other hand, appears quickly after exposure to allergens and can last for weeks, until the pollen season ends. Sneezing is often more frequent and more intense. Nasal discharge is typically clear and watery, and nasal, eye, and palate itching are characteristic. There is no fever.
The mechanisms of the allergic reaction
During an initial exposure to an allergen like birch pollen, the immune system produces specific IgE antibodies without causing symptoms. This is called sensitization. During subsequent exposures, these IgEs trigger the release of histamine and other inflammatory mediators by mast cells in the nasal and conjunctival lining. It is this release of histamine that causes all the characteristic allergy symptoms.
The reaction can occur within minutes of exposure and persist as long as the allergen is present. Some people also develop a late-phase reaction a few hours later, which contributes to chronic nasal congestion during the season.
Exposure reduction measures
Reducing pollen exposure is a complement to drug treatment. Monitoring pollen count reports, available on several Quebec weather sites, allows you to anticipate high-risk days. Pollen concentrations are generally higher in the morning on dry, windy days and lower after rain.
Keeping windows closed during peak pollen times, using air conditioning instead of natural ventilation in the car, changing and showering after extended periods outdoors, and avoiding hanging laundry outside during pollen peaks are practical measures that reduce daily allergen load.
The comparative effectiveness of treatments
Nasal corticosteroids, prescribed by a doctor, are the most effective treatment for moderate to severe allergic rhinitis. They reduce all nasal symptoms, and their effect increases with regular use. Oral antihistamines relieve nasal and eye symptoms but are less effective for congestion. Xylometazoline-based nasal decongestant sprays provide rapid relief from congestion but should not be used for more than five to seven consecutive days to avoid a rebound effect.
Frequently Asked Questions About Allergic Rhinitis
Can allergic rhinitis have complications?
Yes. Untreated or poorly controlled allergic rhinitis can lead to recurrent sinusitis, serous otitis, and worsen asthma if present. Nasal polyposis is a possible complication in severe and chronic cases.
Are there tests to identify the responsible allergens?
Yes. Allergy skin tests, performed by an allergist, can identify the specific allergens that trigger symptoms. This information guides the choice of targeted immunotherapy if this option is considered.
Does allergic rhinitis disappear with age?
For some people, symptoms lessen over time. For others, they persist or worsen. Immunotherapy is the only option that can induce lasting tolerance to allergens.
When to consult a healthcare professional
If you are not sure whether your symptoms are allergy-related, if your seasonal rhinitis is affecting your sleep or daily activities, or if antihistamines are no longer sufficient, you should consult a doctor.
A doctor or a nurse practitioner can assess your symptoms, prescribe appropriate treatment, and refer you to an allergist if necessary. An in-person consultation or teleconsultation at one of our Omicron Clinic in Quebec gives you quick access.
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