Seasonal Allergies: Causes and Symptoms

Don’t let seasonal allergies hold you back

A family outdoors, enjoying the spring weather.

Allergy season is different for everyone. That’s because different kinds of outdoor allergens — or irritants — get distributed into the air year-round. So your seasonal allergies happen from exposure to whatever pollen is being released by the local grass, trees, mold spores, and ragweed whenever that occurs.¹

In this page you will find information about

Outdoor mold allergies

Molds thrive in many environments, both indoors and outdoors. They flourish in damp, humid dwellings. Symptoms include:2

  • Itchy nose or throat
  • Itchy, watery eyes
  • Stuffy or runny nose

Learn how to avoid mold allergens.

Pollen allergies

Millions of Americans have to suffer through allergy symptoms due to exposure to tree, grass and weed pollen. Symptoms include:3

  • Sneezing
  • Nasal congestion
  • Runny nose
  • Watery eyes
  • Itchy throat or eyes

Ragweed allergies

Ragweed allergies are a specific type of pollen allergy. Ragweed season happens in the late fall, happens when certain plant species — like sage and mugwort — distribute pollen into the air. There are many species of ragweed in the United States, so try to keep track of the pollen count in your area.4

Avoid bringing pollen into your home by removing clothes that you’ve worn outdoors and washing them right away.

Symptoms of ragweed allergies include:4

  • Sneezing

  • Itchy nose or throat

  • Itchy eyes

  • Suffy or runny nose

Here are some tips to minimize seasonal allergies.¹

     Stay indoors when the pollen count is high

     Keep windows closed

     Use an air conditioner

     Save outdoor activities for late afternoon

     Avoid gardening when your allergies are active

     Wear a face mask, when you work outdoors

     Keep pollen out of your eyes with wraparound glasses

     Keep grass well trimmed

     Remove pollen from your skin and hair by rinsing after being outside

     Wash or brush your pets after they’ve been outside


A family sit together in the grass and blow bubbles.

Allegra® can help relieve seasonal allergies.

Allegra® helps you live your best life by relieving many common seasonal allergy symptoms. If you experience sneezing, runny nose, itchy, watery eyes or an itchy nose or throat, nasal congestion, sinus congestion and pressure, or swelling of nasal passages, Allegra® products can help. Now you can live your greatness — during any season.

No matter which product you choose, you can feel good knowing Allegra® is the #1 allergist-recommended medicine brand for non-drowsy relief.* 

Find the Allegra® product that’s right for you


  1. NIH Medline Plus Magazine, Editors. What triggers seasonal allergies?, NIH Medline Plus Magazine (,


  2. American Academy of Allergy, Asthma, and Immunology, Editors. Mold Allergy, American Academy of Allergy, Asthma, and Immunology (,


  3. American College of Allergy, Asthma & Immunology, Editors. Pollen Allergy, American College of Allergy, Asthma & Immunology (,


  4. Asthma and Allergy Foundation of America, Editors. Ragweed Pollen Allergy, Asthma and Allergy Foundation of America (,


Recommended Reading

*Allegra is the #1 allergist-recommended non-drowsy brand of adult OTC oral antihistamines and oral antihistamine/pseudoephedrine combination products.