The Sweet Spring Challenge: Seasonal Allergies Waldorf MD

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The blessings of spring get mixed reviews from the estimated 35 million Americans who suffer from seasonal allergies. It's not easy to appreciate the miracles of nature through itchy eyes, runny nose and uncontrollable sneezing.

But what actually causes seasonal allergies? And what are the worst offenders? Below Dr. Gillian Shepard, a clinical associate professor of medicine at Weill Medical College of Cornell University, talks about the arch nemesis of carefree springtime- the seasonal allergy.

What are "seasonal allergies"?

People with seasonal allergies are allergic to something that's in the air for just part of the year. For example, people are often allergic to tree pollen, and the allergy only occurs when the trees produce their flowers and pollen, which lasts for several weeks in most places.

Some very common seasonal allergies are triggered by tree pollen in the springtime, grass in the spring through summer and then ragweed and other weed pollens in the fall.

Which trees cause the worst seasonal allergies?

Almost any tree is capable of inducing allergic reaction if you're programmed that way. In different parts of the country, people will react to different trees depending on what's there. For example, on the east coast, it is very common to be allergic to birch, oak and maple tree pollen. If you go to the western states, you may find that the cottonwood, poplar, and aspen trees are much more of a problem.

Copyright 2009 NBC Health

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