Sinus Infections
How Do Doctors Test for Sinus Infections?
February 9, 2026
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8 minutes
Reviewed by Michael Kaplan, MD
Persistent facial pressure, thick nasal discharge, and a headache that won’t quit — if you’ve been experiencing these symptoms for more than a week, you might be wondering if you have a sinus infection. But how do doctors test for sinus infections?
The answer depends on the severity and duration of your symptoms. Most diagnoses begin with a thorough physical examination where your doctor reviews your symptoms and examines your nasal passages, but additional tests like nasal endoscopy, CT scans, or allergy testing may be needed for chronic or complicated cases.
At Kaplan Sinus Relief, Dr. Michael Kaplan and our team of Houston ENT specialists use advanced diagnostic techniques to accurately identify the root cause of your sinus problems and develop an effective treatment plan tailored to your needs.
If you’re struggling with persistent sinus symptoms that are affecting your quality of life, don’t wait for the problem to worsen. Schedule an appointment with our experienced team to get the relief you deserve.
Medical history and symptom review
The diagnostic process for a sinus infection always begins with a comprehensive medical history and symptom review. Your doctor will ask detailed questions about your sinus infection symptoms, including when they started, how long they’ve lasted, and whether they’ve changed over time.
You’ll be asked about facial pain or pressure, nasal congestion, thick nasal discharge, loss of smell, headaches, and fever, as well as any history of allergies, asthma, or previous sinus infections. This conversation helps your doctor determine whether you have acute, subacute, or chronic sinusitis, and whether you might benefit from the best medicine for sinus drainage based on your specific condition.
Physical examination
During the physical examination, your doctor will perform several hands-on assessments to identify key signs of a sinus infection. They’ll gently press on your face and forehead to check for tenderness and will also check your jaw area since sinus infection jaw pain is a common symptom.
Using a light source, your doctor will look inside your nose to check for redness, swelling, nasal polyps, or a deviated septum. They’ll examine the color and consistency of any nasal discharge and may also check your throat, ears, and neck for related symptoms.
Nasal endoscopy
Nasal endoscopy is a minimally invasive procedure that allows your doctor to see directly inside your nasal passages with exceptional clarity. During this test, your doctor will gently insert a thin, flexible tube called an endoscope into your nostril. The procedure takes just a few minutes and may involve a mild decongestant spray or local anesthetic.
The endoscope allows your doctor to visualize nasal polyps, structural abnormalities, deviated septum, enlarged turbinates, or signs of infection like pus or inflammation around the sinus openings, making it especially valuable for patients with chronic or recurrent sinus infections.
CT scan (computed tomography)
A CT scan of the sinuses is the gold standard imaging test for evaluating sinus infections, particularly when symptoms are severe, chronic, or unresponsive to treatment. This painless procedure takes less than ten minutes and uses X-ray technology to create detailed, cross-sectional images of your sinuses.
CT scans can reveal inflammation, fluid buildup, nasal polyps, tumors, structural abnormalities, and bone changes from chronic infection. This comprehensive view is especially important when your doctor is considering sinus surgery, as it provides a detailed roadmap of your sinus anatomy.
Mucus culture
A mucus culture involves collecting a sample of nasal discharge to identify the specific microorganism causing your infection. Your doctor will use a sterile swab to collect mucus, which is then sent to a laboratory and monitored for bacterial or fungal growth.
Once the organism is identified, the lab performs sensitivity testing to determine which medications will be most effective. Mucus cultures are particularly valuable when you have a chronic infection that hasn’t responded to standard treatment, when your doctor suspects fungus sinus infection symptoms, or when there’s concern about antibiotic-resistant bacteria.
Allergy testing
Allergy testing plays a crucial role in diagnosing sinus infections because allergies are a common underlying cause of chronic sinusitis. Understanding the distinction between rhinitis vs. sinusitis is important here — rhinitis refers to nasal inflammation often caused by allergies, while sinusitis involves inflammation of the sinus cavities themselves.
Testing includes skin prick tests or blood tests that identify specific allergens triggering your symptoms. If testing reveals specific triggers, your doctor can develop a treatment plan that includes allergen avoidance, medication, or immunotherapy to reduce the frequency and severity of sinus infections.
X-rays
While X-rays were once commonly used to diagnose sinus infections, they’ve largely been replaced by CT scans, which provide much more detailed information. However, X-rays may still be used when a CT scan isn’t readily available or when your doctor needs a quick, preliminary assessment.
A sinus X-ray can show fluid levels or cloudiness in the sinus cavities, and the procedure is quick and painless. The limitations include their inability to show fine anatomical details or distinguish between different types of sinus problems as effectively as CT scans or endoscopy.
How do you get rid of a sinus infection fast?
The fastest way to get rid of a sinus infection depends on its cause and severity, but early intervention with the right treatment can significantly speed up your recovery.
Treatment options include:
- Antibiotics: If your infection is bacterial, your doctor may prescribe antibiotics to eliminate the infection and reduce symptoms within a few days.
- Decongestants: Over-the-counter or prescription decongestants help reduce swelling and open up your sinus passages for better drainage.
- Nasal corticosteroid sprays: These prescription sprays reduce inflammation in your nasal passages and sinuses, providing relief from congestion and pressure.
- Saline irrigation: Rinsing your sinuses with a saline solution helps flush out mucus, allergens, and bacteria while keeping your nasal passages moist.
- Pain relievers: Medications like ibuprofen or acetaminophen can help manage facial pain, headaches, and fever.
- Balloon sinuplasty: This minimally invasive procedure opens blocked sinus passages by gently inflating a small balloon in the sinus opening, providing long-term relief for chronic or recurrent infections.
- Functional endoscopic sinus surgery (FESS): For severe cases, surgery may be necessary to remove blockages, polyps, or infected tissue.
For those suffering from recurring infections, chronic sinusitis treatment often requires a more comprehensive approach that addresses underlying causes like allergies, structural abnormalities, or persistent inflammation. The treatment of chronic sinusitis may combine medications, lifestyle modifications, and in some cases, minimally invasive procedures to restore proper sinus function and prevent future infections.
Sinus infection testing — FAQs
How do you get checked for a sinus infection?
To get checked for a sinus infection, schedule an appointment with your primary care doctor or an ENT specialist. Your doctor will review your symptoms, perform a physical examination of your face and nasal passages, and may recommend additional tests like nasal endoscopy or imaging if your symptoms are severe or chronic.
What is mistaken for a sinus infection?
Several conditions share symptoms with sinus infections, including allergies, migraines, tension headaches, and the common cold. Dental infections, nasal polyps, and deviated septum can also cause similar facial pain and congestion. An accurate diagnosis from a healthcare provider is essential to ensure you receive the right treatment.
Can a sinus infection cause ear pain?
Yes, sinus infections commonly cause ear pain because your sinuses, ears, nose, and throat are all connected through small passages. When your sinuses become inflamed and blocked, pressure builds up and affects the Eustachian tubes that connect to your ears. This can lead to a feeling of fullness, muffled hearing, or sharp pain in one or both ears.
From diagnosis to relief — Kaplan Sinus Relief will guide you every step
Understanding how doctors test for sinus infections empowers you to seek the right care when symptoms arise. Whether you need a simple physical examination or more advanced diagnostic testing like nasal endoscopy or CT imaging, the key is getting an accurate diagnosis so you can receive targeted treatment that addresses the root cause of your symptoms — not just temporary relief.
If you’ve been dealing with persistent facial pain, pressure, congestion, or other signs of a sinus infection, don’t wait for your symptoms to worsen or become chronic. Schedule an appointment with Dr. Michael Kaplan and our team to get the expert evaluation and personalized care you deserve.
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