What causes allergies?

The average person in the United States has likely experienced allergies to some degree, whether their own or those of a loved one. But what causes allergies? There’s a range of different sources for allergies. They can come from food, insects, your environment or the particles in indoor air.

Allergies can wreak havoc on your body. To combat allergens that enter, the human body needs to jump into action. Histamine, the chemical that’s produced while your antibodies attack the allergen source, can spur a variety of bodily reactions. People can develop a histamine intolerance when the body has high levels of it, and that intolerance can manifest itself in hives, fatigue, digestive problems, nasal congestion, headaches and other physiological reactions. 

You may experience itchy skin, narrowing airways and general discomfort or pain. Asthma, sneezing, runny nose and swollen or sensitive eyes are the most common signs of an allergic reaction, but other symptoms include low blood pressure, increased heart rate and blood vessel expansion.

Can allergies cause ear pain or ear infections?

Excess mucus and nasal congestion from allergic reactions can irritate your throat and ears. Allergic reactions also lead to swollen tissue and congestion—both of which can cause ear infections. With that congestion, swelling and extra mucus, you may notice your ears will become itchy, uncomfortable or even painful—all symptoms of infection. So the answer to “Can allergies cause ear infections?” is a resounding “yes”.

The eustachian tube—the tube going from your middle ear to the back of your throat—can get blocked due to congestion and inflammation and therefore fill with mucus, germs and bacteria. The same thing happens no matter what kind of allergy you have. If left to fester, that buildup will lead to an infection. Since their eustachian tube is smaller, young children are especially prone to this issue.

What are the treatments for ear pain from allergies?

Before pursuing treatment for your allergy-related ear pain, find out what’s causing these allergic reactions. You can do so by visiting a doctor and undergoing an allergy test.

The skin allergy test involves taking tiny amounts of an allergen and inserting it into the skin to see how it reacts. Or, for those deemed unable to do a skin test, doctors can test blood to see if you have increased amounts of immunoglobulin E—the antibody that attacks allergens and harmful substances. A doctor can determine which test works best for you based on your medical history.

How to relieve ear pain from allergies

How to make your ears stop hurting from allergies? Ear pain caused by allergies is often the result of inflammation or congestion in the Eustachian tubes, which connect the middle ear to the back of the nose and throat. When these tubes become blocked due to allergic reactions—commonly from pollen, dust, pet dander, or mold—pressure can build up in the ear, leading to discomfort or pain.

To relieve ear pain from allergies, start by managing the underlying allergic response. Antihistamines such as cetirizine or loratadine can reduce inflammation and mucus production. Nasal corticosteroid sprays (like fluticasone) are also effective in reducing congestion and Eustachian tube pressure. Using a saline nasal rinse or spray can help clear allergens and mucus from the nasal passages, improving airflow and drainage. Decongestants may provide short-term relief, but they should be used cautiously and only for a few days.

Applying a warm compress to the affected ear can ease discomfort, and chewing gum or yawning may help equalize pressure. If symptoms persist or worsen, especially if accompanied by hearing loss or fever, consult a healthcare provider. In some cases, untreated ear pressure from allergies can lead to ear infections or chronic Eustachian tube dysfunction.

Can allergies cause ear pain on one side only?

Yes, allergies can cause ear pain in one side only, although it’s more common for both ears to be affected. When allergens like pollen, dust, or pet dander trigger an allergic reaction, the Eustachian tubes—which connect the middle ear to the back of the nose—can become inflamed or blocked. This may lead to ear pressure, discomfort, or pain.

If the congestion or blockage is worse on one side, or if you tend to sleep on one side more often, you may experience unilateral (one-sided) ear pain. Fluid buildup, unequal pressure, or localized swelling from sinus congestion can also contribute to discomfort in just one ear.

However, one-sided ear pain can also be caused by ear infections, Temporomandibular Joint (TMJ) issues, or impacted earwax, so it’s important not to assume allergies are the only cause.

If the pain is persistent, severe, or accompanied by symptoms like fever, hearing loss, or drainage, you should consult a healthcare provider to rule out other conditions. For allergy-related ear pain, treating the underlying allergies with antihistamines, nasal sprays, or saline rinses can often provide relief.

Can allergies cause clogged ears?

When you’re exposed to allergens like pollen, dust, mold, or pet dander, your immune system reacts by releasing histamines, which trigger inflammation and mucus production. This can lead to congestion in the nasal passages and Eustachian tubes—the small tubes that connect the middle ear to the back of the nose and throat.

If the Eustachian tubes become blocked due to swelling or mucus, pressure can build up in the middle ear, causing a clogged or full sensation. You might also experience muffled hearing, ear popping, or mild discomfort, especially during allergy season.

Clogged ears from allergies are usually not serious, but they can be uncomfortable. Treatment often includes:

• Antihistamines to reduce the allergic response
• Nasal corticosteroid sprays to relieve inflammation
• Saline rinses or sprays to clear nasal passages
• Decongestants (used short-term) to reduce swelling

If symptoms persist or are accompanied by pain, dizziness, or drainage, consult a healthcare provider. In some cases, untreated allergy-related ear congestion can lead to ear infections or temporary hearing issues.

Can allergies cause an earache and sore throat?

Yes, allergies can cause both an earache and a sore throat.

When you're exposed to allergens such as pollen, dust, mold, or pet dander, your body releases histamines that trigger inflammation and mucus production in the nasal passages and sinuses. This can lead to several related symptoms, including:

• Earache: Inflammation and congestion can block the Eustachian tubes, which help equalize pressure in the middle ear. When these tubes become swollen or filled with mucus, it can cause ear pressure, pain, or a feeling of fullness, especially in one or both ears.
• Sore throat: Allergies often lead to postnasal drip, where excess mucus drains from the sinuses down the back of the throat. This can cause irritation, scratchiness, or soreness, particularly in the morning or after lying down.

Unlike viral infections, allergy-related sore throats and earaches typically do not come with fever or significant fatigue. They may be chronic or seasonal, depending on exposure to allergens.

Treatment usually includes antihistamines, nasal corticosteroid sprays, and saline rinses to reduce inflammation and clear mucus. If symptoms are persistent or worsen, especially on one side, consult a healthcare provider to rule out other causes like infections or structural issues.

When should you see a doctor about allergy related ear pain?

Most ear pain should resolve within two or three days. Consult your doctor about any ear pain that does not improve in 24 to 48 hours, especially if you’re experiencing symptoms such as blood or pus in the ear, high fever, headache, dizziness, swelling or intensified ear pain.