Fall Allergies vs. the Common Cold: How to Tell the Difference
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- Written By: Dr. Gabriel Navar, Family Medicine
As the weather changes, sneezing, a runny nose, and congestion can become all too familiar. But how do you know if your symptoms are caused by seasonal allergies or a common cold? Because the two conditions share many symptoms, it can sometimes be difficult to tell them apart. Understanding the key differences can help you find the right relief and know when it’s time to seek medical care. Our family medicine physician, Dr. Gabriel Navar, shares what to look for, how to manage symptoms, and when to schedule an appointment.
What causes fall allergies, and what are the most common triggers?
Allergies happen when your immune system overreacts to something harmless in the air. Your body releases histamine and other chemicals, which cause the sneezing, itching, and runny or stuffy nose so many people know well.
In the fall, the biggest trigger is ragweed pollen. Mold is a close second, especially here in South Louisiana, where warm, humid weather and damp piles of fallen leaves give it plenty of places to grow. Dust mites can also stir up symptoms when we close up the house and turn on the heat for the first time. Because our warm weather lingers, allergy season here often lasts later into the fall than it does in other parts of the country.
What are the key differences between fall allergies and a common cold?
The biggest difference is the cause. A cold is a viral infection. It’s contagious, and it usually runs its course in about a week to 10 days. Allergies are your immune system reacting to something in your environment. They aren’t contagious, and they last as long as you’re exposed to your trigger. Colds also tend to bring a sore throat, body aches, and sometimes a low-grade fever, while allergies tend to cause itching. The cause matters for treatment, too: most allergy medicines target the allergic reaction, so they do little for a cold.
Which symptoms are the best clues for distinguishing between the two?
If I had to pick one clue, it’s itching. Itchy, watery eyes, an itchy nose, or an itchy throat point strongly toward allergies. A fever, on the other hand, points toward an infection.
Timing and patterns help, too. Allergy symptoms tend to show up soon after exposure, flare after time outdoors or yard work, return around the same time each year, and ease up when you’re indoors. Cold symptoms usually build over a day or two, often start with a sore throat, and frequently follow a sick family member or coworker.
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How long do allergy symptoms typically last compared with cold symptoms?
Most colds start to improve within 7 to 10 days, although a cough can hang on for a couple of weeks after other symptoms clear. Allergy symptoms last as long as you’re exposed to your trigger. With ragweed, that can mean weeks or even months, often until the first hard frost, which may not come until late in the year here.
A good rule of thumb: if your “cold” has lasted more than two weeks with no fever, or you seem to catch the same cold every fall, allergies are a likely cause.
What can people do to prevent or minimize fall allergy symptoms?
Limiting your exposure to triggers goes a long way:
- Check daily pollen and mold counts, and limit time outdoors when they’re high, especially on dry, windy days.
- Keep windows closed at home and in the car, and use the air conditioning instead.
- Change your A/C filter regularly. A high-efficiency filter can trap more pollen and mold spores.
- Shower and change clothes after spending time outside, and wash your bedding weekly in hot water.
- Wear a mask when raking leaves, mowing, or doing other yard work.
- Keep indoor humidity below about 50% to discourage mold and dust mites.
- If fall allergies hit you every year, start your allergy medicine a week or two before your symptoms usually begin, rather than waiting until you’re miserable.
What are the best ways to manage mild symptoms at home?
For allergies, a few over-the-counter options work well:
- Second-generation antihistamines are a mainstay of treatment. These include cetirizine (Zyrtec), loratadine (Claritin), and fexofenadine (Allegra). They block histamine, the chemical behind sneezing, itching, and a runny nose, and they’re much less likely to make you drowsy than older antihistamines like diphenhydramine (Benadryl). Cetirizine makes some people a little sleepy, so taking it at bedtime can help. For best results, take one every day during your allergy season.
- Steroid nasal sprays, such as fluticasone (Flonase) or triamcinolone (Nasacort), are the most effective option for nasal allergy symptoms, especially congestion. Use them daily, and give them several days to reach full effect. Aim the spray toward the outer side of your nostril, away from the center, to avoid irritation and nosebleeds.
- Antihistamine nasal sprays, such as azelastine (Astepro), deliver the medicine right where symptoms start and start working faster than steroid sprays. They help with congestion as well as sneezing and a runny nose. Some people notice a bitter taste. If a steroid spray alone isn’t enough, adding Astepro is a good next step; it’s the same pairing found in some prescription sprays.
- Antihistamine eye drops, such as ketotifen (Zaditor, Alaway) or olopatadine (Pataday), relieve itchy, watery eyes.
- Saline rinses wash pollen and mucus out of your nose. Always use distilled, sterile, or boiled-and-cooled water, never water straight from the tap. Tap water is safe to drink but can contain organisms that are dangerous in your sinuses.
For a cold, the goal is to feel better while your body clears the virus:
- Rest and drink plenty of fluids. Warm liquids like tea or broth can soothe a sore throat and loosen congestion.
- Use a cool-mist humidifier, and try saline spray or rinses for a stuffy nose.
- A spoonful of honey can calm a cough in adults and children older than 1. Never give honey to babies under 12 months.
- Acetaminophen or ibuprofen can ease aches and fever.
Keep in mind that antibiotics don’t work against cold viruses, so they won’t help you get over a cold faster.
Are over-the-counter allergy and cold medications safe for everyone?
Not always. Being available without a prescription doesn’t mean a medicine is right for everyone. A few things to watch for:
- Decongestant pills like pseudoephedrine (the Sudafed kept behind the pharmacy counter) can raise blood pressure and heart rate and make it hard to sleep. Check with your doctor first if you have high blood pressure, heart disease, glaucoma, thyroid problems, or an enlarged prostate. Also know that products labeled “PE,” such as Sudafed PE, contain oral phenylephrine, which an FDA review found doesn’t effectively relieve congestion.
- Decongestant nasal sprays like oxymetazoline (Afrin) shouldn’t be used for more than three days in a row. Longer use can cause rebound congestion that’s worse than what you started with.
- Older antihistamines like diphenhydramine (Benadryl) cause drowsiness that can affect driving. In older adults, they can also contribute to confusion, falls, and trouble urinating.
- Children under 4 shouldn’t take over-the-counter cough and cold medicines. For older kids, use a children’s product and check the right dose with your child’s doctor or pharmacist.
- Multi-symptom products often contain acetaminophen. Taking more than one at a time can add up to a dangerous dose.
If you’re pregnant, breastfeeding, managing a chronic condition, or taking prescription medications, ask your doctor or pharmacist before starting anything new.
When should someone schedule an appointment with their primary care provider?
Make an appointment if:
- Cold symptoms last more than 10 days without improving, or you start to feel better and then suddenly get worse. That can be a sign of a sinus infection or another complication.
- Allergy symptoms aren’t controlled with over-the-counter treatments or are affecting your sleep, work, or school.
- You get frequent sinus infections, ear infections, or asthma flare-ups during allergy season.
- You’d like allergy testing or want to talk about longer-term treatment.
- You have a chronic condition such as asthma, COPD, heart disease, or diabetes and aren’t sure which medicines are safe for you.
If over-the-counter medicines aren’t enough, prescription options can help:
- Combination nasal sprays, such as azelastine-fluticasone (Dymista) or olopatadine-mometasone (Ryaltris), put a steroid and an antihistamine in one bottle. That’s simpler than juggling two sprays and can help when one spray alone isn’t controlling symptoms.
- Ipratropium nasal spray (Atrovent Nasal) works differently from antihistamines. It dries up a constantly runny nose, whether the drip comes from allergies or a cold.
- Montelukast (Singulair) is a once-daily pill that blocks leukotrienes, another chemical involved in allergic reactions. It can be a good fit for people who have both allergies and asthma. Because it carries an FDA warning about possible mood and behavior changes, such as vivid dreams, trouble sleeping, or depression, it’s usually saved for people who haven’t done well with other treatments. We’ll talk through whether it’s right for you.
- Prescription eye drops can calm itchy, red, watery eyes that don’t respond to over-the-counter drops.
- Allergy immunotherapy, given as allergy shots or as a tablet that dissolves under the tongue, gradually retrains your immune system to tolerate your triggers. It’s the only treatment that targets the allergy itself rather than just the symptoms. Allergy testing comes first. For ragweed, the daily tablet (Ragwitek) has to be started at least 12 weeks before the season, so spring is the time to plan for next fall.
And if you’re not sure what you’re dealing with, come in. Fall is also flu and COVID-19 season, and some of those illnesses have antiviral treatments that work best when started within the first few days of symptoms.
What warning signs mean someone should seek medical attention promptly?
Seek medical care right away if you have:
- Trouble breathing, shortness of breath, or wheezing, especially if your rescue inhaler isn’t helping
- Chest pain or pressure
- A fever of 103°F or higher, or any fever that lasts more than four days
- A severe headache, stiff neck, or confusion
- Swelling, redness, or pain around one or both eyes, or changes in vision
- Signs of dehydration, such as dizziness or urinating very little
- Symptoms that improve and then come back with a fever and a worse cough
- In babies younger than 3 months, any fever of 100.4°F or higher
If you have severe trouble breathing, bluish lips or face, or swelling of the lips, tongue, or throat, call 911.
What is your top recommendation for staying healthy during the fall season?
Get your flu shot, and wash your hands often. Fall is when cold and flu viruses start making the rounds, and these two simple habits are among the best ways to protect yourself and your family. Ask us whether COVID-19 or RSV vaccines are right for you, too.
If you have fall allergies, don’t wait for symptoms to start. Begin your treatment early and limit your exposure on high-pollen days. And if you don’t have a primary care provider, now is a great time to establish care. When you do get sick, it helps to have someone who already knows your health history.
While fall allergies and the common cold can cause similar symptoms, paying attention to how you feel, how long symptoms last, and whether you experience signs such as itchy eyes or a fever can help you determine what may be causing your discomfort. Simple prevention strategies and at-home treatments may provide relief, but persistent or worsening symptoms shouldn’t be ignored.