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Birch trees are known for their tall, thin trunks and white bark. But did you know they trigger a lot of allergy symptoms for much of the population each spring? These allergy symptoms can range from nasal symptoms, like sneezing and a stuffy nose, to the lesser-known oral allergy syndrome (OAS).

What Is OAS?

If you have a pollen allergy, you could have OAS. It is a mild form of food allergy.1 With OAS, your mouth and throat may itch or tingle right after you eat certain raw fruits, vegetables, seeds or nuts. You might even get hives where the food touched your skin or swelling of your mouth, lips, tongue and throat. Many people with OAS can eat the foods that cause reactions if they are cooked or if the skin is removed.

It might seem strange that you would react to some foods because of airborne tree pollen. This happens when your immune system gets confused. The pollen is similar to the proteins in some foods, so your body can’t tell the difference. So if you are allergic to birch pollen, your body might think it’s invading your body when you eat an apple. This is called cross-reactivity.

What’s the Difference Between OAS and Anaphylaxis?

The symptoms of OAS sound similar to anaphylaxis. So how do you know the difference?

Anaphylaxis (anna-fih-LACK-sis) is a severe reaction that comes on quickly and usually affects more than one organ system (part of the body), such as the skin or mouth, the lungs, the heart and the gut. It requires epinephrine and immediate medical attention. Some symptoms include:

  • Skin rashes, itching or hives

  • Swelling of the lips, tongue or throat

  • Shortness of breath, trouble breathing or wheezing (whistling sound during breathing)

  • Dizziness and/or fainting

  • Stomach pain, bloating, vomiting or diarrhea

  • Uterine cramps

  • Feeling like something awful is about to happen

OAS is milder and often only affects the mouth. It can come on immediately when eating the offending food and go away quickly after eating the food.

But call your doctor if your OAS:

  • Gets worse

  • Happens when you eat nuts or cooked fruits and vegetables

  • Trigger any of the above symptoms of anaphylaxis

What Foods Could I React to If I Have a Birch Pollen Allergy?

If you are allergic to birch pollen, there are several foods you could react to. But you may not react to every food on the list. Here are foods that cross-react with a birch pollen allergy:

  • Almond

  • Apple

  • Apricot

  • Carrot

  • Celery

  • Cherry

  • Hazelnut

  • Kiwi

  • Parsley

  • Peach

  • Peanut

  • Pear

  • Plum

  • Soybean

If you do not have symptoms when eating birch-related fruits and vegetables, you may continue to eat them as tolerated. If you have severe OAS symptoms, you should discuss this with an allergist. You’ll want to avoid eating the foods that trigger them, especially when birch pollen is high. Birch trees release their pollen between January to April, depending on where they grow. And birch trees grow throughout most of the United States, so they are hard to avoid.

If you have a reaction to almonds, hazelnuts or peanuts, you might have more serious symptoms. These nuts can cause anaphylaxis, a serious, life-threatening reaction. If you have symptoms when eating these nuts, talk to your doctor right away.

Birch trees are not the only plants that can trigger OAS. If you have symptoms of OAS, your doctor can perform tests to diagnose your pollen allergies so OAS won’t leave you guessing.

Effectively managing asthma is key to leading a fulfilling life with the condition. This involves having a qualified asthma specialist, a comprehensive treatment plan, and steadfast adherence to that plan. Proactive management can significantly decrease the frequency of asthma attacks, minimize illness and emergency room visits, allowing individuals to enjoy a full and active life.

Asthma, Allergies, and the Americans with Disabilities Act

The Americans with Disabilities Act (ADA), a federal civil rights law, recognizes asthma and allergies as disabilities. Through the ADA, individuals with asthma and allergies gain support in creating environments that are safer and healthier, fostering a more inclusive society.

Traveling Safely with Asthma and Allergies

Individuals with asthma and allergies must take specific precautions while traveling, be it by plane, train, or car. By following these planning tips, one can prepare for a travel experience that prioritizes safety and health.

Asthma in Infants

Infants and toddlers possess smaller airways compared to older children and adults. Even minor obstructions caused by factors such as viral infections, constricted airways, or mucus can pose breathing challenges for young children. Understanding and addressing these issues is crucial for the well-being of infants with asthma.

Asthma During Pregnancy

Expectant mothers with asthma must exercise extra caution in managing their condition, as uncontrolled asthma can pose risks to the child. Pregnancy may also exacerbate asthma symptoms. Consulting with a healthcare professional is essential to determine the best course of treatment for pregnant individuals with asthma.

Asthma in Children

Asthma stands as the most prevalent chronic disease among children. Genetic factors and certain allergies increase a child's likelihood of developing asthma. Parents and guardians play a crucial role in supporting their children by gaining knowledge about asthma and maintaining regular communication with the child's healthcare provider.

Asthma in Adults

While many develop asthma in childhood, adults may experience the onset of asthma later in life, even in their 50s or 60s. Adult-onset asthma tends to be more persistent than childhood asthma. Adults managing asthma alongside other medications should collaborate with their healthcare provider to find an optimal treatment plan, taking into consideration potential interactions with other medications.

Asthma in Older Adults

Asthma is prevalent among adults aged 65 and older, often going undiagnosed or untreated. Diagnosis can be challenging due to concurrent health issues. Regular communication with a healthcare provider is crucial for effectively managing asthma in older adults, reducing the risk of asthma-related complications.


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