Find Information About:

Drugs & Supplements

Get information and reviews on prescription drugs, over-the-counter medications, vitamins, and supplements. Search by name or medical condition.

Pill Identifier

Pill Identifier

Having trouble identifying your pills?

Enter the shape, color, or imprint of your prescription or OTC drug. Our pill identification tool will display pictures that you can compare to your pill.

Get Started
My Medicine

My Medicine

Save your medicine, check interactions, sign up for FDA alerts, create family profiles and more.

Get Started

WebMD Health Experts and Community

Talk to health experts and other people like you in WebMD's Communities. It's a safe forum where you can create or participate in support groups and discussions about health topics that interest you.

  • Second Opinion

    Second Opinion

    Read expert perspectives on popular health topics.

  • Community


    Connect with people like you, and get expert guidance on living a healthy life.

Got a health question? Get answers provided by leading organizations, doctors, and experts.

Get Answers

Sign up to receive WebMD's award-winning content delivered to your inbox.

Sign Up

Allergies Health Center

Select An Article

Summer Allergies

Font Size

Many of the same allergic triggers that can make you feel bad in spring last into summer.

What Causes Summer Allergies?

Like spring, the biggest summer allergy trigger is inhalant allergens. When pollen gets into the noses of certain people, it triggers the runny nose, itchy eyes, and other allergy symptoms.

Higher pollen counts usually mean worse symptoms.

Trees are usually done pollinating by late spring, leaving mostly grasses and weeds to trigger summer allergies.

Allergies vary by the region in which you live. Here are some of the worst summer allergy offenders:





Russian thistle





Blue grasses


Red Top

Sweet vernal


One of the most common summer allergy triggers is ragweed. Ragweed can travel for hundreds of miles in the wind. Even if it doesn’t grow where you live, it can make you feel bad if you’re allergic to it.

Summer air pollution can make allergy symptoms worse. One of the most common pollutants is ozone, which is created in the atmosphere by a combination of sunlight, nitrogen oxide, and hydrocarbons from burning fuel. The stronger sunlight and calmer winds during summer can create clouds of ozone around some cities.

Bees, wasps, yellow jackets, hornets, and other insects can also cause allergic reactions in some people when they sting. Fire ants are also out in summer. Their bites can also cause life threatening allergic reactions.

Inside, molds love damp areas, including the basement and bathrooms. Their spores get into the air and can cause problems for allergy sufferers.

Dust mites -- microscopic insects -- peak during summer. They thrive in warm, humid temperatures and nest in beds, fabric, and carpets. Their residue can get into the air, triggering sneezes, wheezes, and runny noses.

What Are the Symptoms of Summer Allergies?

Summer allergy symptoms include:

Allergic reactions to insects usually cause mild symptoms, such as itching and localized swelling. But in a small percentage of people they can lead to a severe allergic reaction, with swelling of the throat or tongue, dizziness, nausea, and shock. This is an emergency and requires immediate medical help.

Next Article:

Today on WebMD

man blowing nose
Make these tweaks to your diet, home, and lifestyle.
Allergy capsule
Breathe easier with these products.
cat on couch
Live in harmony with your cat or dog.
Woman sneezing with tissue in meadow
Which ones affect you?

blowing nose
woman with sore throat
lone star tick
Woman blowing nose

Send yourself a link to download the app.

Loading ...

Please wait...

This feature is temporarily unavailable. Please try again later.


Now check your email account on your mobile phone to download your new app.

cat lying on shelf
Allergy prick test
Man sneezing into tissue
Woman holding feather duster up to face, twitching