Is It Fall Allergies, a Cold, or the Flu? How to Tell the Difference

The sneezing started. Your nose is running, your throat feels scratchy, and you are not sure if you caught something or if fall allergies are back. Across Chicagoland, that guessing game is happening in a lot of households right now, and getting the answer right matters. The right fix depends on what is actually causing your symptoms.

Here is how to tell fall allergies, a cold, and the flu apart, and when it is time to see an allergist.

Why Fall Allergies Hit Chicagoland So Hard

Many people think allergy season ends when spring does. In Illinois, fall is just as tough. Two big triggers take over:

• Ragweed pollen. Ragweed typically starts releasing pollen in late summer and keeps going until the first hard frost. The pollen is light and travels far on the wind, so you do not need to live near a field to react to it.

• Mold spores. Damp fallen leaves are a perfect place for mold to grow, and raking or blowing leaves sends spores into the air you breathe.

Indoor triggers join in once the weather cools. Windows close, the furnace kicks on for the first time, and dust and mold that have settled in vents get circulated through your home. Back to school adds classroom dust and mold exposure for kids.

3 Questions That Point to Allergies

• Do your eyes and nose itch? Itching is the biggest clue. Colds and the flu rarely cause itchy eyes, nose, or throat. Allergies almost always do.

• Is there a fever or body aches? Allergies do not cause a fever or make your muscles ache. If you have either one, think cold or flu.

• Has it been going on for more than 10 days? A cold usually fades within about a week to ten days. Symptoms that drag on for weeks, or return every fall, point toward allergies.

Ragweed Allergy Symptoms to Watch For

Ragweed allergy symptoms often show up in late summer and early fall and may include:

• Frequent sneezing, especially in the morning

• Runny or stuffy nose with clear mucus

• Itchy, watery, or red eyes

• Itchy throat or roof of the mouth

• Postnasal drip and a lingering cough

Mold Allergy Symptoms to Watch For

Mold allergy symptoms look similar, but they tend to flare after raking leaves, spending time in a damp basement, or on rainy, humid days. Along with sneezing and congestion, people with mold allergies may notice coughing, wheezing, and itchy or watery eyes. If you have asthma, mold can trigger asthma symptoms too.

When to See a Doctor or an Allergist

Get prompt medical care if you have a high fever, trouble breathing, chest pain, or symptoms that suddenly get worse. If you think you have the flu, call your primary care provider quickly, since antiviral medication works best when started early.

Consider seeing an allergist if:

• Your symptoms last more than two weeks or return every fall

• Over-the-counter allergy medicine is not helping or you need it every day

• You have wheezing, shortness of breath, or a cough that will not quit

• Sinus pressure, headaches, or infections keep coming back

• Allergies are affecting your sleep, school, or work

How an Allergist Finds Your Triggers

Guessing is frustrating and can mean months of the wrong treatment. An allergist can pinpoint what you are reacting to with a skin test or a blood test. Once you know whether ragweed, mold, dust mites, pets, or something else is the cause, you can build a plan that fits. That may include trigger avoidance, the right medications, or immunotherapy, which works to build long-term tolerance instead of only covering up symptoms.

Simple Ways to Ease Fall Allergy Symptoms at Home

• Check the pollen count before outdoor plans, and keep windows closed on high days.

• Shower and change clothes after being outside so pollen does not follow you to bed.

• Wear a mask when raking leaves or mowing, and consider handing off leaf cleanup if mold is a trigger.

• Change your HVAC filter before heating season and run a HEPA filter in the bedroom.

• Wash bedding weekly in hot water to cut down on dust mites and pollen.

Frequently Asked Questions

Can allergies cause a sore throat?

Yes. Postnasal drip from allergies can leave your throat scratchy or sore, though it usually comes with itching, sneezing, and no fever.

Can you have allergies and a cold at the same time?

Yes, and it happens often. If your symptoms change, such as mucus turning thick or a fever appearing, a cold or infection may be layered on top of your allergies.

How long do fall allergies last in Illinois?

Ragweed season generally lasts until the first hard frost, and mold can linger as long as leaves stay damp. Without treatment, symptoms can last for weeks.

Stop Guessing. Get Tested.

If your fall symptoms keep coming back, you deserve a clear answer. The allergy specialists at Allergy, Asthma & Sinus Centers see patients at four Chicagoland locations: Crest Hill, Aurora, Countryside, and Bolingbrook. Our team can identify your triggers and build a plan so you can enjoy the season instead of dreading it.