Allergies and Runny Nose: Causes, Symptoms, and How to Find Lasting Relief

By: Dr. Madeleine Herman, MD

https://www.youtube.com/watch?v=xbb3p7EEbWk

Why Do Allergies Cause a Runny Nose?

A runny nose occurs when the lining of the nose becomes inflamed and produces excess mucus. In people with allergies, the immune system overreacts to harmless particles such as pollen, mold, dust mites, or pet dander. This triggers the release of histamine and other inflammatory chemicals that cause swelling, itching, sneezing, and nasal drainage.

This condition is known as allergic rhinitis, often referred to as hay fever — even though it has nothing to do with hay or fever.

In Houston, allergy symptoms can be particularly severe due to long pollen seasons, high mold levels, humidity, and year-round environmental exposure.

Common Symptoms of Allergic Rhinitis

Allergy-related nasal symptoms often include:

• Constant runny nose or postnasal drip

• Sneezing fits

• Nasal congestion or stuffiness

• Itchy nose, eyes, throat, or ears

• Watery or red eyes

• Sinus pressure or headaches

• Cough from postnasal drainage

• Fatigue and poor sleep

Symptoms may be seasonal (spring and fall) or year-round (perennial allergies).

What Triggers Nasal Allergies?

Common allergy triggers include:

🌳 Tree, grass, and weed pollen🏠 Dust mites🐶 Pet dander🍄 Mold spores🚬 Smoke and air pollution🧼 Strong fragrances and irritants

Identifying your specific triggers allows more targeted treatment.

How ENTs Diagnose Allergies and Chronic Runny Nose

Diagnosis starts with a detailed history and nasal examination. Your ENT may recommend:

• Allergy skin testing or blood testing

• Nasal endoscopy to evaluate inflammation or polyps

• Sinus imaging if chronic sinusitis is suspected

• Evaluation for non-allergic rhinitis or reflux

Not all runny noses are caused by allergies, so proper diagnosis is essential.

Best Treatments for Allergies and Runny Nose

🌬️ Nasal Steroid Sprays

Reduce inflammation and mucus production (fluticasone, mometasone).

💦 Saline Rinses

Flush allergens and thin secretions.

💊 Antihistamines

Reduce sneezing and itching (cetirizine, loratadine, fexofenadine).

🚿 Anticholinergic Sprays

Helpful for excessive watery drainage (ipratropium).

💉 Allergy Immunotherapy

Shots or drops that retrain the immune system for long-term relief.

🏡 Environmental Controls

HEPA filters, dust mite covers, frequent washing of bedding, pet hygiene.

When a Runny Nose Isn’t Allergies

Not all runny noses are allergic. Other causes include:

• Viral infections

• Non-allergic (vasomotor) rhinitis

• Cold air or temperature changes

• Hormonal changes

• Medication side effects

• Structural nasal problems

• Cerebrospinal fluid (rare but serious)

Persistent or unusual drainage should be evaluated.

When Should You See an ENT or Allergist?

Schedule an evaluation if you have:

• Symptoms lasting longer than 4–6 weeks

• Poor response to over-the-counter medications

• Frequent sinus infections

• Sleep disruption or mouth breathing

• Thick, discolored drainage

• Facial pain or pressure

• Nosebleeds or one-sided symptoms

Expert Allergy Care in Houston

At SCENT Houston – Sinus Center & ENT Specialists of Houston, we provide comprehensive allergy testing and personalized treatment plans for patients of all ages. From medical management to immunotherapy and sinus care, our team helps you breathe easier year-round.

Serving Memorial, Katy, The Woodlands, and Greater Houston.