Summer allergies and oral allergy syndrome

If you are one of the thirty million people suffering from summertime seasonal allergies, it is important to know about pollen-food syndrome, also known as oral allergy syndrome (OAS), caused by allergens such as ragweed pollen. 

Each year, grass pollens and weeds cause seasonal suffering and ragweed begins to bloom around early August in many areas of the U.S.  In the warmer climates weed pollens may be seen during much of the year.

Itchiness of the mouth and throat immediately after eating fresh fruits or vegetables are common symptoms of OAS. Oral allergy syndrome results from a cross-reaction between allergy antibodies directed towards pollens with similar proteins that are found in foods in about one-third of seasonal allergy sufferers.  Individuals with ragweed allergies might experience these symptoms when consuming foods such as:

• Banana
• Cucumber
• Melon
• Zucchini
• Sunflower seeds
• Chamomile tea
• Echinacea

Grass pollen allergic individuals might experience symptoms when ingesting

• fig
• melons
• tomatoes
• oranges
• Mugwort (weed pollen) allergic sufferers may suffer after eating:
• carrots
• celery
• coriander
• fennel
• parsley
• peppers

Generally, cooking or microwaving the food will eliminate a reaction, but not always.  Less commonly it is possible for the OAS to induce mouth and throat swelling if you are allergic to various foods. 

For additional information from the American Academy of Allergy, Asthma and Immunology at http://www.aaaai.org/media/news_releases/2006/08/080206.stm

Dr. Clifford W. Bassett is an assistant clinical professor of medicine at the Long Island College Hospital and on the faculty of NYU School of Medicine.  He is the current vice chair for public education committee of the American Academy of Allergy, Asthma and Immunology.  No information in this blog is intended as medical advice to any reader or intended to diagnose or treat any medical condition.

If you believe your summer and fall allergies are actually getting worse, you are probably correct.  For a quick explanation, good old global warming and overproduction of greenhouse gases may be the cause. More than 40 million allergy sufferers in the U.S. have seasonal and year-round allergies. Studies show that plant pollen production such as ragweed (season starts mid-August) and spring tree pollens go way up as a result of exposure to carbon dioxide, a major contributor in greenhouse gases.

Plant ecologist Lewis Ziska with the U.S. Dept. of Agriculture is a pioneer in studying allergies and climate change.  The warmer temperatures are also having an effect even in Alaska, leading to a possible increase in pollen and mold allergies as well as stinging insects.  An Intergovernmental Panel on Climate Change (a leading authority on effects of global warming) as well as the U.S. EPA cites an increase in allergic reactions.

Data from the American Academy of Allergy, Asthma and Immunology show that one ragweed plant can produce 1 billion pesky pollen grains that wreak misery to those sufferers.  So if you magnify this number by two to four times you have a “mega-pollen burst”!  Pollens grains may also travel up to 400 miles leaving almost no location untouched. 

Be prepared and develop a sound survival plan:

• Pre-treat with your prescribed allergy medications before exposure
• Keep windows closed – this will reduce indoor pollen levels
• Use the air conditioner unit – place on “do not recirculate”
• Avoid certain foods that may aggravate those (about one-third of sufferers) with ragweed allergy such as bananas, melons, cucumbers, zucchini, chamomile tea, sunflower seeds and even echinacea
• Shower nightly to remove excess pollen that accumulates in your hair, skin and eyelids
• Take your summer vacation to an area where pollen levels are typically lower, such as a beach or lake
• Consider moving outdoor activities or exercise indoors during high pollen times of the day, generally between 10 a.m. to 4 p.m. (even more so on “windy” days)
• Check out your local pollen count at www.aaaai.org/nab

Global warming and greenhouse gases are here to stay, so sufferers let’s make ourselves better prepared in living successfully with our less allergy friendly environment. 

Dr. Clifford W. Bassett is an assistant clinical professor of medicine at the Long Island College Hospital and on the faculty of NYU School of Medicine.  He is the current vice chair for public education committee of the American Academy of Allergy, Asthma and Immunology.  No information in this blog is intended as medical advice to any reader or intended to diagnose or treat any medical condition.