(Hay Fever; Seasonal Allergies)
Allergic rhinitis is the set of symptoms that occurs when you breathe in substances you are allergic to. These substances are called allergens and are small proteins.
- Seasonal (intermittent) allergic rhinitis (sometimes called hay fever or rose fever)—This occurs during times of the year when allergens are in the air. Spring and Fall are the most common times. The most common allergen are tree, grass or weed pollens..
- Perennial (persistent) allergic rhinitis—This condition is caused by allergens, such as chemicals, dust, dust mites, cockroaches, animal dander, mold spores, or, occasionally, foods. It may occur any time of year that you encounter these allergens.
An allergic reaction occurs when your body's immune system overreacts to an allergen. When you breathe in an allergen, cells in your nasal passages make a chemical called histamine. Histamine causes your nose to feel itchy and also causes swelling and mucus production in the nasal passages.
Site of Histamine Production
These factors increase your chance of developing allergic rhinitis. Tell your doctor if you have any of these risk factors:
Allergic rhinitis can cause the following symptoms:
Your doctor will try to find out which allergens you are allergic to. You may be referred you to an allergist, if necessary.
Tests may include:
Skin Prick Test
A tiny bit of an allergen is placed under the skin with a needle. The doctor watches to see if the skin in that area becomes red, raised, and itchy. This can be done for multiple allergens at the same time.
To diagnose you, your doctor may ask about your medical history and do the skin prick test. These two diagnostic techniques may
A small sample of blood is taken and tested for different allergens.
You breathe in air containing an allergen. The doctor will watch to see if you have an allergic reaction, such as wheezing or trouble breathing. This test is usually reserved for research settings.
The most effective way to treat allergies is to avoid the allergen. Since this can sometimes be difficult or impossible, other treatments are available.
Treatments may include:
- Antihistamines—stop the interaction between histmamine and the receptors; block the action of histmaine; usually taken as pills or syrup
- Decongestants—decrease congestion by constricting blood vessels, taken as pills or as a nasal spray; use of the nasal spray may lead to rebound congestion
- Mast cell inhibitors—nasal sprays that interfere with the chemical reactions leading to histamine release
- Topical corticosteroids—nasal sprays that decrease swelling in the nasal passages
Immunotherapy (Allergy Shots) and Sublingual Therapy
With immunotherapy, very small amounts of allergens are injected over weeks, months, or even years. The goal is to make your body's immune system less sensitive to those allergens.
There's another, similar type of treatment called sublingual immunotherapy]]> . It involves placing small amounts of allergens under the tongue. This treatment is more popular in Europe. While it has shown to reduce symptoms in some studies, more research is needed.
If you are diagnosed with allergic rhinitis, follow your doctor's instructions .
The following strategies may help prevent allergic rhinitis :
- Stay inside during the morning hours when pollen counts are highest.
- Avoid outside activities during the time of year when the trees, grasses, weeds, or molds are blooming.
- Keep the windows of your house and car closed to keep pollen out.
- Use an air conditioner to reduce indoor humidity and to prevent mold and mildew growth.
- Clean your air conditioner's filters regularly.
- Consider running an air purifier in your home, especially in your bedroom.
- Use vacuum cleaners and air conditioners with HEPA filters to trap allergens.
- Decrease or avoid outdoor activities on hot summer days, when ozone levels may make your symptoms worse.
- Cover pillows and mattresses with vinyl covers to reduce your exposure to dust mites.
- Wash bedding weekly in very hot water.
- Use fewer dust-collecting items, such as curtains, bed skirts, carpeting, and stuffed animals, especially in your bedroom.
- If you can't avoid having a furry pet, vacuum frequently and keep your pet out of bedrooms and other rooms with carpets.
American Academy of Allergy, Asthma, and Immunology
Asthma and Allergy Foundation of America
Allergy Asthma Information Association
Calgary Allergy Network
Conn HF, Rakel RE. Conn's Current Therapy 2001 . 53rd ed. Philadelphia, PA: WB Saunders Company; 2001.
Joint Council of Allergy, Asthma, and Immunology website. Available at: http://www.jcaai.org . Accessed June 15, 2008.
Middleton E. Allergy: Principles and Practice . 5th ed. St. Louis, MO: Mosby-Year Book, Inc; 1998.
National Institute of Allergy and Infectious Disease website. Available at: http://www3.niaid.nih.gov/ . Accessed June 15, 2008.
Patients and Consumer. American Academy of Allergy, Asthma, and Immunology website. Available at: http://www.aaaai.org/patients.stm . Accessed June 15, 2008.
¹8/11/2006 DynaMed's Systematic Literature Surveillance http://www.ebscohost.com/dynamed/what.php : Durham SR, Yang WH, Pedersen MR, et al. Sublingual immunotherapy with once-daily grass allergen tablets: a randomized controlled trial in seasonal allergic rhinoconjunctivitis. J Allergy Clin Immunol . 2006;117:802-809.
Last reviewed September 2009 by ]]>Julie D. K. McNairn, MD]]>
Please be aware that this information is provided to supplement the care provided by your physician. It is neither intended nor implied to be a substitute for professional medical advice. CALL YOUR HEALTHCARE PROVIDER IMMEDIATELY IF YOU THINK YOU MAY HAVE A MEDICAL EMERGENCY. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with any questions you may have regarding a medical condition.
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