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Allergic rhinitis

Hay fever; Nasal allergies; Seasonal allergy; Seasonal allergic rhinitis; Allergies - allergic rhinitis; Allergy - allergic rhinitis

Allergic rhinitis is a diagnosis associated with a group of symptoms affecting the nose. These symptoms occur when you breathe in something you are allergic to, such as dust, animal dander, or pollen. Symptoms can also occur when you eat a food that you are allergic to.

This article focuses on allergic rhinitis due to plant pollens. This type of allergic rhinitis is commonly called hay fever or seasonal allergy.

 

Causes

An allergen is something that triggers an allergy. When a person with allergic rhinitis breathes in an allergen such as pollen, mold, animal dander, or dust, the body releases chemicals that cause allergy symptoms.

Hay fever involves an allergic reaction to pollen.

Plants that cause hay fever are trees, grasses, and weeds. Their pollen is carried by the wind. (Flower pollen is carried by insects and does not cause hay fever.) Types of plants that cause hay fever vary from person to person and from area to area.

The amount of pollen in the air can affect whether hay fever symptoms develop or not.

  • Hot, dry, windy days are more likely to have a lot of pollen in the air.
  • On cool, damp, rainy days, most pollen is washed to the ground.

Hay fever and allergies often run in families. If both of your parents have hay fever or other allergies, you are likely to have hay fever and allergies, too. The chance is higher if your mother has allergies.

Symptoms

Symptoms that occur shortly after you come into contact with the substance you are allergic to may include:

Symptoms that may develop later include:

  • Stuffy nose (nasal congestion)
  • Coughing
  • Clogged ears and decreased sense of smell
  • Sore throat
  • Dark circles under the eyes
  • Puffiness under the eyes
  • Fatigue and irritability
  • Headache

Exams and Tests

The health care provider will perform a physical exam and ask about your symptoms. 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 pollen or other substances that trigger your symptoms. Skin testing is the most common method of allergy testing.

If your doctor determines you cannot have skin testing, special blood tests may help with the diagnosis. These tests, known as IgE RAST tests, can measure the levels of allergy-related substances.

A complete blood count (CBC) test, called the eosinophil count, may also help diagnose allergies.

Treatment

LIFESTYLE AND AVOIDING ALLERGENS

The best treatment is to avoid the pollens that cause your symptoms. It may be impossible to avoid all pollen. But you can often take steps to reduce your exposure.

You may be prescribed medicine to treat allergic rhinitis. The medicine your doctor prescribes depends on your symptoms and how severe they are. Your age and whether you have other medical conditions, such as asthma, will also be considered.

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 1 cup (240 milliliters) of warm water, half a teaspoon (3 grams) of salt, and pinch of baking soda.

Treatments for allergic rhinitis include:

ANTIHISTAMINES

Medicines called antihistamines work well for treating allergy symptoms. They may be used when symptoms do not happen often or do not last long. Be aware of the following:

  • Many antihistamines taken by mouth can be bought without a prescription.
  • Some can cause sleepiness. You should not drive or operate machines after taking this type of medicine.
  • Others cause little or no sleepiness.
  • Antihistamine nasal sprays work well for treating allergic rhinitis. Ask your doctor if you should try these medicines first.

CORTICOSTEROIDS

  • Nasal corticosteroid sprays are the most effective treatment for allergic rhinitis.
  • They work best when used nonstop, but they can also be helpful when used for shorter periods of time.
  • Corticosteroid sprays are generally safe for children and adults.
  • Many brands are available. You can buy four brands without a prescription. For all other brands, you will need a prescription from your doctor.

DECONGESTANTS

  • Decongestants may also be helpful for reducing symptoms such as nasal stuffiness.
  • Do not use nasal spray decongestants for more than 3 days.

OTHER MEDICINES

  • Leukotriene inhibitors are prescription medicines that block leukotrienes. These are the chemicals the body releases in response to an allergen that also trigger symptoms.

ALLERGY SHOTS

Allergy shots (immunotherapy) are sometimes recommended if you cannot avoid the pollen and your symptoms are hard to control. This includes regular shots of the pollen you are allergic to. Each dose is slightly larger than the dose before it, until you reach the dose that helps control your symptoms. Allergy shots may help your body adjust to the pollen that is causing the reaction.

SUBLINGUAL IMMUNOTHERAPY TREATMENT (SLIT)

Instead of shots, medicine put under the tongue may help for grass and ragweed allergies.

Outlook (Prognosis)

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 trigger. But once a substance, such as pollen, causes allergies, it often continues to have a long-term effect on the person.

When to Contact a Medical Professional

Call for an appointment with your provider if:

  • You have severe hay fever symptoms
  • Treatment that once worked for you no longer works
  • Your symptoms do not respond to treatment

Prevention

You can sometimes prevent symptoms by avoiding the pollen you are allergic to. During pollen season, you should stay indoors where it is air-conditioned, if possible. Sleep with the windows closed, and drive with the windows rolled up.

References

Baroody FM, Naclerio RM. Allergy and immunology of the upper airway. In: Flint PW, Haughey BH, Lund V, et al, eds. Cummings Otolaryngology: Head & Neck Surgery. 6th ed. Philadelphia, PA: Elsevier Saunders; 2015:chap 38.

Corren J, Baroody FM, Pawankar R. Allergic and nonallergic rhinitis. In: Adkinson NF Jr, Bochner BS, Burks AW, et al, eds. Middleton's Allergy: Principles and Practice. 8th ed. Philadelphia, PA: Elsevier Saunders; 2014:chap 42.

Wallace DV, Dykewicz MS, Oppenheimer J, Portnoy JM, Lang DM. Pharmacologic treatment of seasonal allergic rhinitis: synopsis of guidance from the 2017 joint task force on practice parameters. Ann Intern Med. 2017;167(12):876-881. PMID: 29181536 www.ncbi.nlm.nih.gov/pubmed/29181536.

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  • Allergies

    Animation

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    Allergies - Animation

    Blooming flowers and blossoming trees are signs that spring has arrived. But for some people, those blossoms and blooms are also signs that allergy season is under way. And that means months of sniffling, sneezing, and runny eyes ahead. You may know that you have allergies as soon as you step outside on a spring day, eat peanuts, or pet your dog. Signs of an allergy may include trouble breathing, teary eyes, hives, itching, or vomiting after you come in contact with your allergy trigger. Your doctor can also do allergy tests to find out whether you're allergic, and what triggers your allergies. The most common type of allergy test is a skin test. The doctor puts a small amount of different allergy-causing substances under your skin. Then you wait for signs of a reaction, like swelling or redness. You might also have blood tests to check for chemicals that are related to allergies. So, how are allergies treated? There are a few medicines you can buy at your local drugstore or your doctor can prescribe to treat your allergies. Antihistamines prevent histamine chemicals from triggering allergy symptoms. Decongestants shrink swollen blood vessels throughout your body, including inside your nose, perhaps helping you breathe easier. Steroid drugs reduce swelling and inflammation. And Leukotriene inhibitors block the substances that trigger allergies. If your allergy is really bugging you, your doctor may give you allergy shots. When you take allergy shots over time, eventually they can help your body get used to the substance so you don't over-react to it in the future. Usually you can relieve allergies by taking medicine and avoiding whatever it is that triggers them. But in some people, allergies to insect stings or certain foods, like peanuts, cause a life-threatening reaction. This is called anaphylaxis. And if you have a life-threatening allergic reaction, call immediately for emergency medical help.

  • Allergy symptoms - illustration

    The immune system normally responds to harmful substances such as bacteria, viruses and toxins by producing symptoms such as runny nose and congestion, post-nasal drip and sore throat, and itchy ears and eyes. An allergic reaction can produce the same symptoms in response to substances that are generally harmless, like dust, dander or pollen. The sensitized immune system produces antibodies to these allergens, which cause chemicals called histamines to be released into the bloodstream, causing itching, swelling of affected tissues, mucus production, hives, rashes, and other symptoms. Symptoms vary in severity from person to person.

    Allergy symptoms

    illustration

  • Allergic rhinitis - illustration

    Allergic rhinitis, or hay fever, is a collection of symptoms, predominantly in the nose and eyes, to allergens such as dust, dander and pollen. The sensitized immune system produces antibodies to these allergens, which cause chemicals called histamines to be released into the bloodstream, causing itching, swelling of affected tissues, mucus production, hives, rashes, and other symptoms. Symptoms vary in severity from person to person.

    Allergic rhinitis

    illustration

  • Recognizing invader - illustration

    An allergy occurs when the immune system reacts to substances (allergens) that are generally harmless and in most people do not cause an immune response. Antibodies are formed by the immune system in response to the presence of an antigen such as pollen, mold, dust or dander.

    Recognizing invader

    illustration

  • Allergies

    Animation

  •  

    Allergies - Animation

    Blooming flowers and blossoming trees are signs that spring has arrived. But for some people, those blossoms and blooms are also signs that allergy season is under way. And that means months of sniffling, sneezing, and runny eyes ahead. You may know that you have allergies as soon as you step outside on a spring day, eat peanuts, or pet your dog. Signs of an allergy may include trouble breathing, teary eyes, hives, itching, or vomiting after you come in contact with your allergy trigger. Your doctor can also do allergy tests to find out whether you're allergic, and what triggers your allergies. The most common type of allergy test is a skin test. The doctor puts a small amount of different allergy-causing substances under your skin. Then you wait for signs of a reaction, like swelling or redness. You might also have blood tests to check for chemicals that are related to allergies. So, how are allergies treated? There are a few medicines you can buy at your local drugstore or your doctor can prescribe to treat your allergies. Antihistamines prevent histamine chemicals from triggering allergy symptoms. Decongestants shrink swollen blood vessels throughout your body, including inside your nose, perhaps helping you breathe easier. Steroid drugs reduce swelling and inflammation. And Leukotriene inhibitors block the substances that trigger allergies. If your allergy is really bugging you, your doctor may give you allergy shots. When you take allergy shots over time, eventually they can help your body get used to the substance so you don't over-react to it in the future. Usually you can relieve allergies by taking medicine and avoiding whatever it is that triggers them. But in some people, allergies to insect stings or certain foods, like peanuts, cause a life-threatening reaction. This is called anaphylaxis. And if you have a life-threatening allergic reaction, call immediately for emergency medical help.

  • Allergy symptoms - illustration

    The immune system normally responds to harmful substances such as bacteria, viruses and toxins by producing symptoms such as runny nose and congestion, post-nasal drip and sore throat, and itchy ears and eyes. An allergic reaction can produce the same symptoms in response to substances that are generally harmless, like dust, dander or pollen. The sensitized immune system produces antibodies to these allergens, which cause chemicals called histamines to be released into the bloodstream, causing itching, swelling of affected tissues, mucus production, hives, rashes, and other symptoms. Symptoms vary in severity from person to person.

    Allergy symptoms

    illustration

  • Allergic rhinitis - illustration

    Allergic rhinitis, or hay fever, is a collection of symptoms, predominantly in the nose and eyes, to allergens such as dust, dander and pollen. The sensitized immune system produces antibodies to these allergens, which cause chemicals called histamines to be released into the bloodstream, causing itching, swelling of affected tissues, mucus production, hives, rashes, and other symptoms. Symptoms vary in severity from person to person.

    Allergic rhinitis

    illustration

  • Recognizing invader - illustration

    An allergy occurs when the immune system reacts to substances (allergens) that are generally harmless and in most people do not cause an immune response. Antibodies are formed by the immune system in response to the presence of an antigen such as pollen, mold, dust or dander.

    Recognizing invader

    illustration

A Closer Look

 

Talking to your MD

 

Self Care

 

Tests for Allergic rhinitis

 
 

Review Date: 2/27/2018

Reviewed By: Stuart I. Henochowicz, MD, FACP, Associate Clinical Professor of Medicine, Division of Allergy, Immunology, and Rheumatology, Georgetown University Medical School, Washington, DC. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.

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