Seasonal Allergies or Sinus Infection? How Imaging Helps Diagnose Chronic Sinus Issues
If you feel congested, have facial pressure, or wake up with a headache during allergy season, you’re not alone. For many people, springtime brings sneezing, sinus pressure, and a runny nose. But how do you know if it’s seasonal allergies or something more serious like a chronic sinus infection?
Allergies and sinus infections can cause many of the same symptoms, which is why imaging plays an important role when sinus problems don’t go away or keep coming back.
Allergies vs. Sinus Infections: What’s the Difference?
Seasonal allergies and sinus infections can feel very similar, but they have different causes. Seasonal allergies are often triggered by pollen, mold, or other allergens while sinus infections (sinusitis) occur when the sinuses become inflamed or blocked, often due to infection.
Seasonal Allergy Symptoms
- Sneezing
- Itchy or watery eyes
- Clear, thin nasal drainage
- Runny or stuffy nose
- Itchy nose or throat
- Postnasal drip
- Symptoms that come and go
- Symptoms improve with allergy medication
- Often seasonal
- Rarely causes facial pain
Sinus Infection (Sinusitis) Symptoms
- Facial pain or pressure
- Thick yellow or green nasal discharge
- Nasal congestion that does not improve
- Headache
- Tooth pain
- Reduced sense of smell
- Fever (sometimes)
- Fatigue
- Symptoms lasting more than 10 days
- Symptoms lasting 12+ weeks may indicate chronic sinusitis
Because symptoms can overlap, imaging such as a CT scan may be helpful in determining whether ongoing sinus problems are caused by allergies, infection, structural issues, or chronic inflammation.
How Imaging Helps Diagnose Chronic Sinus Problems
A CT scan of the sinuses is the most common and effective imaging test for chronic sinus issues. It creates detailed images of the sinus cavities and surrounding structures.
A sinus CT can show:
- Blocked sinus drainage pathways
- Fluid buildup
- Chronic inflammation
- Nasal polyps
- Structural issues such as a deviated septum
- Signs of long-standing infection
Unlike allergy symptoms that come and go, these findings suggest a chronic (long term) condition that may require a different treatment approach.
Why Imaging Matters for Accurate Diagnosis
Without imaging, sinus issues can sometimes be misdiagnosed or treated repeatedly without lasting relief. Imaging may help doctors:
- Determine the cause of persistent facial pain, pressure congestion, or headaches
- Investigate recurrent sinus infections
- Plan effective treatment or surgical options, if necessary
Accurate imaging leads to more targeted care and better outcomes for patients.
What to Expect During a Sinus CT Scan
Many patients worry about imaging and are not sure what to expect, but a sinus CT scan is:
- Quick (often just a few minutes)
- Non-invasive
- Painless
You’ll lie still on a table that moves into a donut-shaped scanner while the scanner takes images of your sinuses. There’s no recovery time, and you can resume normal activities right away.
The Role of Radiologists in Your Care
Radiologists are physicians specially trained to interpret medical images. When your sinus CT is completed, a radiologist carefully reviews the images and provides a detailed report to your healthcare provider.
Don’t Ignore Ongoing Sinus Symptoms
If sinus pressure, congestion, or headaches have become part of your daily life, it may be time to look deeper than seasonal allergies.
Imaging can provide answers and help your provider find the right treatment so you can breathe easier year round.
Eastern Radiologists offers CT Scans in our Greenville and Kinston locations, with appointments available Monday – Saturday.