Why You Might Feel Feverish During Allergy Season—And What to Do About It

Allergy season affects millions of people each year with symptoms like sneezing, nasal congestion, itchy eyes, and fatigue. But one symptom often leads to confusion and concern: feeling feverish. Naturally, the question arises—can allergies cause fever?

While fever is not a classic allergy symptom, many allergy sufferers report feeling warm, flushed, or generally unwell during peak allergy times. So, what’s behind this sensation? Is it really a fever or something else entirely?

Fever vs. Feeling Feverish

First, it’s important to differentiate between an actual fever and the sensation of being feverish. A fever is a measured body temperature of 100.4°F (38°C) or higher, usually triggered by infection. Feeling feverish, however, can mean you’re experiencing warmth, fatigue, or body aches without an elevated temperature.

Can Allergies Cause Fever?

The simple answer is no, allergies themselves do not directly cause fever. However, allergies can make you feel miserable in other ways that mimic the sensation of a fever.

Reasons you might feel feverish during allergy season include:

• Inflammation: Allergic reactions cause inflammation, which can create a feeling of internal heat.
• Fatigue: Constant sneezing, congestion, and poor sleep can lead to exhaustion, making you feel run down.
• Dehydration: Nasal drainage, mouth breathing, and antihistamines may lead to dehydration, contributing to symptoms like dizziness or flushed skin.
• Sinus Pressure: Sinus inflammation may make your head feel heavy or warm, especially around the forehead and cheeks.

When Fever Is a Red Flag

If you're experiencing true fever with a thermometer-confirmed elevated temperature, it’s time to consider other causes. Allergies do not typically raise your core body temperature. Instead, consider:

• A sinus infection caused by long-standing congestion
• An upper respiratory infection like a cold or flu
• A secondary bacterial infection from untreated allergy symptoms

In these cases, fever is a symptom of an infection, not the allergy itself. So when asking, can allergies cause fever, the better way to look at it is that allergies can lead to conditions where fever might occur.

Symptoms That Suggest Infection

Here are signs that your symptoms may be more than just allergies:

• Fever above 100.4°F (38°C)
• Facial pain or pressure
• Yellow or green nasal discharge
• Persistent cough with mucus
• Body aches or chills

If these symptoms appear, consult a healthcare provider.

How to Manage That “Feverish” Feeling

If your body temperature is normal but you still feel unwell, here’s how to ease symptoms:

1. Stay Hydrated Drink water throughout the day to stay hydrated and reduce feelings of dizziness or dryness.
2. Use Cool Compresses A cold compress over the forehead or eyes can ease sinus pressure and make you feel cooler.
3. Improve Air Quality Use an air purifier, keep windows closed, and clean filters regularly to reduce allergen exposure.
4. Take Breaks Rest when needed, especially if allergies are draining your energy.
5. Use Antihistamines Wisely Choose non-drowsy options during the day and discuss long-term use with a healthcare provider.

Preventing Allergy-Related Infections

The best way to avoid complications that can cause fever is to manage allergy symptoms proactively:

• Rinse nasal passages daily
• Avoid outdoor exposure during peak pollen times
• Shower and change clothes after being outside
• Wash bedding frequently
• Keep indoor humidity below 50% to prevent mold

Can Children Feel Feverish from Allergies?

Yes, children can feel tired, hot, or flushed during allergy attacks, especially if they’re not sleeping well. But again, actual fever should prompt investigation for infection, such as:

• Ear infections
• Sinusitis
• Strep throat

Always use a thermometer to distinguish real fever from perceived warmth.

Allergies vs. Other Conditions

Sometimes people mistake allergy symptoms for other illnesses. Here’s how they compare:

ConditionSneezingFeverNasal DischargeFatigueAllergiesYesRareClearMild to moderateColdYesMildYellow/greenModerateFluSometimesHighVariableSevereCOVID-19SometimesCommonVariableSevere

Recognizing these patterns can help you respond appropriately.

When to See a Doctor

Seek medical attention if:

• Your symptoms worsen or persist for more than 10 days
• You have a persistent or high-grade fever
• You experience ear pain, facial swelling, or breathing difficulty
• Your child appears very lethargic or irritable

A proper diagnosis ensures that you get the right treatment and prevent complications.

Final Thoughts

So, can allergies cause fever? The evidence shows that they typically do not. What they can do, however, is make you feel feverish due to inflammation, fatigue, dehydration, or sinus pressure. If a real fever occurs, it may indicate an infection triggered by untreated allergy symptoms.

Pay attention to your symptoms, track your body temperature, and don’t hesitate to seek medical advice if something feels off. With the right strategies, you can stay comfortable and safe throughout allergy season.

FAQs About Feeling Feverish During Allergy Season

Q1. Why do I feel hot and tired during allergy season?

A1. Inflammation, dehydration, and fatigue from allergy symptoms can make you feel feverish even without a true fever.

Q2. How can I tell if I actually have a fever?

A2. Use a digital thermometer. Feeling warm doesn’t necessarily mean your body temperature is elevated.

Q3. Can untreated allergies lead to infections?

A3. Yes. Chronic congestion can lead to sinus or ear infections, which may cause fever.

Q4. Should I stay home if I feel feverish during allergy season?

A4. If your body temperature is normal and you're sure it's allergies, you can resume normal activities. If in doubt, rest and monitor symptoms.

Q5. Can I take fever-reducing medicine if I feel bad but don’t have a fever?

A5. It’s better to focus on hydration, rest, and allergy relief. Medications like acetaminophen are best reserved for actual fever or pain.