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Allergic rhinitis is a group of symptoms affecting the nose. These symptoms occur when you breathe in something you are allergic to, such as dust, dander, insect venom, or pollen.
This article focuses on allergic rhinitis due to outdoor triggers, such as plant pollen. This type of allergic rhinitis is commonly called hay fever.
Hay fever; Nasal allergies
An allergen is something that triggers an allergy. When a person with allergic rhinitis breathes in an allergen such as pollen or dust, the body releases chemicals, including histamine. This causes allergy symptoms.
Hay fever involves an allergic reaction to pollen. A similar reaction occurs with allergy to mold, animal dander, dust, and other allergens that you breathe in.
The pollens that cause hay fever vary from person to person and from area to area. Tiny, hard-to-see pollens often cause hay fever. Examples of plants that cause hay fever include:
The amount of pollen in the air can affect whether hay fever symptoms develop. Hot, dry, windy days are more likely to have increased amounts of pollen in the air. On cool, damp, rainy days most pollen is washed to the ground.
Allergies are common. Your genes and environment may make you more likely to get allergies.
Allergies often run in families. If both your parents have allergies, you are likely to have allergies too. The chance is greater if your mother has allergies.
Symptoms that occur shortly after you come into contact with the substance you are allergic to may include:
Symptoms that may develop later include:
People with allergic rhinitis often have allergy symptoms that also involve the eyes.
The health care provider will perform a physical exam and ask you questions about your symptoms. Your history of symptoms is important in diagnosing allergic rhinitis. You will be asked whether your symptoms vary by time of day or season, and exposure to pets or other allergens.
Allergy testing may reveal the substances that trigger your symptoms. Skin testing is the most common method of allergy testing. See the article on allergy testing for detailed information.
If your doctor determines you cannot have skin testing, special blood tests may help with the diagnosis. These tests can measure the levels of allergy-related substances, especially one called immunoglobulin E (IgE).
A complete blood count (CBC) test called the eosinophil white blood cell count may also help diagnose allergies.
LIFESTYLE AND AVOIDING ALLERGENS
The best treatment is to avoid what causes your allergic symptoms. It may be impossible to completely avoid all your triggers. However, you can often take steps to reduce your exposure to triggers such as:
There are many different medicines to treat allergic rhinitis. Which one your doctor prescribes depends on the type and severity of your symptoms, your age, and whether you have other medical conditions (such as asthma).
For mild allergic rhinitis, a nasal wash can help remove mucus from the nose. You can buy a saline solution at a drug store or make one at home using one cup of warm water, half a teaspoon of salt, and pinch of baking soda.
Treatments for allergic rhinitis include:
Antihistamines work well for treating allergy symptoms. They are often used when symptoms do not happen very often or do not last very long.
Certain illnesses that are caused by allergies (such as asthma and eczema) may need other treatments.
Allergy shots (immunotherapy) are sometimes recommended if you cannot avoid the allergen and your symptoms are hard to control. This includes regular injections of the allergen. Each dose is slightly larger than the dose before it. Allergy shots may help your body adjust to the substance that is causing the reaction (antigen).
Most symptoms of allergic rhinitis can be treated. More severe cases need allergy shots.
Some people (especially children) may outgrow an allergy as the immune system becomes less sensitive to the allergen. However, once a substance causes allergies, it usually continues to affect the person over the long term.
Call for an appointment with your health care provider if:
You can sometimes prevent symptoms by avoiding known allergens. During pollen season, people with hay fever should stay indoors where it is air conditioned, if possible.
Wallace DV, Dykewicz MS, Bernstein DI, Blessing-Moore J, Cox L, Khan DA, et al. The diagnosis and management of rhinitis: an updated practice parameter. J Allergy Clin Immunol. 2008 Aug:122(2).
Frew AJ. Allergen immunotherapy. J Allergy Clin Immunol. 2010 Feb;125(2 Suppl 2):S306-13.
Greiner AN, Hellings PW, Rotiroti G, Scadding GK. Allergic rhinitis. Lancet. 2011;378(9809):2112-2122.
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