Health Library

Health Library

Allergens: Pollen

What is pollen?

Pollen is the tiny egg-shaped male cells of flowering plants, including trees, grasses, and weeds. Pollen is microscopic in size.

It is the most common cause of seasonal allergic rhinitis, sometimes known as hay fever.

Which plants produce pollen that cause allergic reactions?

Plants that have powdery granules of pollen that are easily blown by the wind, such as:

  • Trees, such as oak, western red cedar, elm, birch, ash, hickory, poplar, sycamore, maple, cypress, walnut, catalpa, olive, and pecan

  • Grasses, such as Timothy, Johnson, Bermuda, orchard, sweet vernal, red top, and some blue grasses

  • Weeds, such as ragweed, sagebrush, pigweed, tumbleweed, Russian thistle, and cockle weed

Most flowering plants, such as roses, have heavier, waxy pollens that are not as easily wind-blown.

When is pollen season?

Each plant has a pollen season. It usually starts in the spring, but may begin as early as January in the southern areas of the U.S. The season usually lasts until November.

Can allergic rhinitis in pollen season be prevented?

To lessen the effects of allergic rhinitis during pollen season, the American Academy of Allergy, Asthma, and Immunology suggests the following:

  • Keep windows closed at night and use air conditioning, which cleans, cools, and dries the air.

  • Minimize outdoor activities early in the morning, between 5 a.m. and 10 a.m., when pollen is most prevalent.

  • Keep car windows closed when traveling.

  • Take a vacation to an area where pollen is not as prevalent, such as the ocean.

  • Take the medications prescribed by your doctor.

  • Don't spend much time outdoors when the pollen count is high.

  • Don't rake leaves during pollen season.

  • If you are allergic to grass, wear a mask or have someone else mow the lawn.  

  • Don't hang bedding or clothing outside to dry.

Allergens: Pollen - WellSpan Health

Online Medical Reviewer: Akin, Louise, RN
Online Medical Reviewer: MMI board-certified, academically affiliated clinician
© 2014 WellSpan Health. All Rights Reserved. This information is not intended as a substitute for professional medical care. Always follow your healthcare professional's instructions.

Are you sure you would like to cancel?

All information will be lost.

Yes No ×

About the provider search

This search will provide you with WellSpan Medical Group and Northern Lancaster County (Ephrata) Medical Group primary care physicians and specialists. If we don’t have a WellSpan Medical Group physician to meet your criteria, the search will expand to include community physicians who partner with WellSpan Medical Group physicians through the WellSpan Provider Network or provide care to patients on the Medical Staffs of WellSpan’s Hospitals.

×