Many patients in Houston wonder whether their symptoms are caused by a sinus infection or seasonal allergies. Because both conditions can cause nasal congestion, runny nose, sinus pressure, and postnasal drip, it can be difficult to tell the difference. Understanding the key symptoms can help you determine when it's time to see a Houston sinus specialist.

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Signs of Allergies

Allergies occur when your immune system reacts to environmental triggers such as pollen, mold, dust mites, or pet dander. In Houston, allergy symptoms are especially common due to the region's long growing season and high pollen counts.

Common allergy symptoms include:

• Sneezing

• Itchy nose, eyes, ears, or throat

• Clear, watery nasal drainage

• Nasal congestion

• Postnasal drip

• Symptoms that occur seasonally or after exposure to allergens

Allergies rarely cause fever and typically do not produce thick yellow or green mucus. Many Houston patients notice their symptoms worsen during tree, grass, or weed pollen seasons.

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Signs of a Sinus Infection

A sinus infection, also called sinusitis, occurs when the lining of the sinuses becomes inflamed and swollen, preventing normal drainage. Sinus infections may develop after a cold, viral illness, allergy flare, or due to chronic sinus disease.

Common sinus infection symptoms include:

• Facial pressure or pain

• Thick yellow or green nasal drainage

• Nasal congestion

• Reduced sense of smell

• Upper tooth pain

• Headaches

• Fatigue

• Symptoms lasting more than 10 days

• Symptoms that worsen after initially improving

Unlike allergies, sinus infections often cause significant facial pressure and can make patients feel generally ill or fatigued.

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Can Allergies Cause Sinus Infections?

Yes. Allergies are one of the most common causes of recurrent sinus infections in Houston. Chronic allergy inflammation can block the normal drainage pathways of the sinuses, creating an environment where infections can develop. Many patients with frequent sinus infections also have untreated allergies, nasal polyps, a deviated septum, or other causes of nasal obstruction.

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When Should You See a Sinus Specialist?

You should consider seeing a Houston ENT or sinus specialist if:

• Symptoms last longer than 10 days

• You experience frequent sinus infections

• Over-the-counter medications are not helping

• You have chronic nasal congestion

• You have recurrent facial pressure or headaches

• You struggle to breathe through your nose

• Your symptoms keep returning despite treatment

A comprehensive evaluation may include a nasal endoscopy and, when appropriate, a CT scan of the sinuses to identify the underlying cause of your symptoms.

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Expert Sinus Care in Houston

If you're unsure whether you have allergies, a sinus infection, or another cause of chronic nasal symptoms, Dr. Madeleine Herman at SCENT Houston – Sinus Center & ENT Specialists of Houston can help. Using advanced diagnostic tools including nasal endoscopy and in-office CT imaging, Dr. Herman evaluates the root cause of chronic congestion, sinus pressure, recurrent sinus infections, and difficulty breathing through the nose. Patients throughout Houston trust SCENT Houston for comprehensive sinus care, allergy evaluation, balloon sinuplasty, and advanced sinus surgery when needed.

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​At SCENT Houston – Sinus Center & ENT Specialists of Houston, patients are evaluated by a board-certified ENT with advanced training in sinus and nasal airway surgery. Dr. Madeleine Herman specializes in treating complex sinus conditions, nasal obstruction, and breathing issues using both traditional and minimally invasive techniques—tailored to each patient’s anatomy and symptoms. Dr. Herman is a Houstonia Magazine Top Doctor 2020-2026, a Houston Chronicle "Best of the Best" 2026 nominee, and has multiple publications in advanced sinonasal disease treatments. You can also relax knowing that every evaluation and surgery is performed by her.