You finished the antibiotics. You rinsed, sprayed and slept propped up. Three weeks later you still have the pressure behind your eyes, the thick drainage and the stuffy nose that makes every morning feel like the start of a cold. At this point the useful question is not how to push through another round. It is why the infection keeps hanging on.
In many cases the answer is that it was never a simple infection to begin with. This guide explains the seven most common reasons sinus symptoms linger, how to tell an acute infection from chronic sinusitis, and what an ENT can do that another prescription cannot.
Quick answer: A sinus infection that won't go away after 10 days, or that improves and then gets worse, needs a medical evaluation. Symptoms that last 12 weeks or longer are defined as chronic sinusitis, which is ongoing inflammation rather than a simple infection. Common reasons symptoms persist include a viral cause that antibiotics cannot treat, a deviated septum, nasal polyps, uncontrolled allergies and rebound from decongestant sprays. An ENT can see inside the sinuses with endoscopy or CT and match treatment to the actual cause.
How Long Should a Sinus Infection Last?
The timeline tells you a lot about what you are dealing with.
| Pattern | What it is called | What it usually means |
|---|---|---|
| Under 10 days and improving | Acute sinusitis, often viral | Usually resolves on its own |
| More than 10 days without improvement, or better then worse | Possible bacterial sinusitis | See a clinician |
| Several separate infections within a year | Recurrent acute sinusitis | Look for an underlying cause |
| 12 weeks or longer, even with treatment | Chronic sinusitis | Ongoing inflammation; ENT evaluation |
The CDC advises seeing a healthcare provider for sinus symptoms that last more than 10 days without improving, symptoms that get worse after improving, severe headache or facial pain, fever lasting longer than three to four days, or multiple sinus infections in the past year. Mayo Clinic defines chronic sinusitis as sinus inflammation that lasts 12 weeks or longer, even with treatment.
7 Reasons Your Sinus Infection Won't Go Away
1. It is viral, so antibiotics were never going to fix it
According to the CDC, most sinus infections get better on their own without antibiotics, and unnecessary antibiotics carry real risks, including side effects and allergic reactions. If your symptoms began with a cold, the lingering congestion may be viral inflammation that simply takes time, not a failed antibiotic.
2. It is actually chronic sinusitis
Chronic sinusitis is inflammation that keeps the sinuses from draining, not a single infection. Mayo Clinic lists its main symptoms as thick, discolored drainage, post-nasal drip, congestion, facial pain or swelling, and reduced smell and taste. Because it is driven by inflammation, repeated short antibiotic courses often provide only temporary relief.
3. A deviated septum is blocking drainage
When the wall between the nostrils is off center, it can narrow one side of the nose and limit how well the sinuses drain. Mayo Clinic notes that a deviated septum can block one or both nostrils and that swelling of the nasal or sinus lining makes that blockage worse. Structural problems do not respond to medication alone. See deviated septum treatment at Elite ENT.
4. Nasal polyps
Polyps are soft, noncancerous growths in the nasal and sinus lining. Mayo Clinic lists them among the structural causes of chronic sinusitis. They often reduce smell and keep passages blocked until they are treated directly.
5. Allergies keep re-inflaming the lining
If allergies are uncontrolled, the sinus lining never fully calms down. Treating each infection without addressing the allergy is like mopping the floor with the faucet still running. Allergy testing and allergy shots can break that cycle.
6. Rebound congestion from decongestant sprays
Decongestant nose sprays feel like the fastest fix, but Mayo Clinic warns that using them for more than a few days can cause rebound congestion that worsens each time the spray wears off. Many people mistake this rebound cycle for an infection that will not clear.
7. The source is not your sinuses
Mayo Clinic lists dental infections among the causes of chronic sinusitis, because the roots of the upper teeth sit close to the maxillary sinuses. And a nose that runs constantly without facial pressure may be chronic rhinitis, a different condition with different treatment.
Red Flags That Need Care Right Away
Mayo Clinic advises seeking immediate care for sinus symptoms along with:
- Fever
- Swelling or redness around the eyes
- Severe headache
- Swelling of the forehead
- Confusion
- Double vision or other vision changes
- Stiff neck
These can signal an infection spreading beyond the sinuses and should not wait for a routine appointment.
What an ENT Does Differently
A primary care visit usually treats the symptoms in front of it. An ENT visit is designed to find out why they keep returning. At Elite ENT, a chronic sinusitis evaluation with Dr. Luis Vazquez, DO may include:
- Nasal endoscopy, a thin camera that shows the drainage pathways, polyps and septum directly
- A CT scan of the sinuses to map the anatomy and confirm chronic disease
- Culture-directed antibiotics when infection is present, so the medication matches the bacteria
- Allergy testing when allergies may be driving inflammation
The American Academy of Otolaryngology-Head and Neck Surgery updated its clinical practice guideline on adult sinusitis in 2025, reflecting how central accurate diagnosis is to choosing the right treatment.
Chronic Sinusitis Treatment Options
Most treatment plans start with medical therapy, such as saline irrigation and prescription steroid sprays, and move to procedures only when that is not enough.
| Option | What it does | Recovery |
|---|---|---|
| Saline irrigation and steroid sprays | Clear mucus and reduce inflammation | None |
| Culture-directed antibiotics | Target a confirmed bacterial infection | None |
| Allergy immunotherapy | Reduces allergy-driven inflammation over time | None |
| Balloon sinuplasty | Gently widens blocked sinus openings with a small balloon; at Elite ENT, done in the office under local numbing | Most people return to normal activity in 24 to 48 hours |
| Endoscopic sinus surgery (FESS) | Removes blockages, diseased tissue or polyps through the nostrils | Longer than balloon sinuplasty; varies by extent |
| Septoplasty | Straightens a deviated septum | Varies |
Cleveland Clinic notes that balloon sinuplasty may be recommended when symptoms last longer than 12 weeks, and that studies suggest faster recovery and less post-procedure pain compared with traditional sinus surgery. It is not right for every case. The choice depends on your anatomy, whether polyps are present and which sinuses are involved, which is why imaging and endoscopy come first.
If your main complaint is pressure rather than infection, our guide on how to relieve sinus pressure covers what helps at home.
Frequently Asked Questions
How long is too long for a sinus infection?
See a clinician if symptoms last more than 10 days without improving, or get better and then worse. Symptoms lasting 12 weeks or longer meet the definition of chronic sinusitis and are best evaluated by an ENT.
Why didn't antibiotics clear my sinus infection?
The most common reasons are that the infection was viral, that the problem is chronic inflammation rather than infection, or that a structural issue such as a deviated septum or nasal polyps is blocking drainage. Antibiotics do not fix any of those.
Do I need a CT scan for chronic sinusitis?
Not everyone does, but a sinus CT is often used to confirm chronic sinusitis and to plan procedures such as balloon sinuplasty or endoscopic sinus surgery. Your ENT will recommend imaging based on your exam and history.
Is balloon sinuplasty right for everyone with chronic sinusitis?
No. It works best for certain patterns of blocked sinus openings. Extensive polyps or disease in multiple areas may be better treated with endoscopic sinus surgery. An exam and imaging determine which option fits.
Should I see an ENT or an allergist for sinus problems?
If you have facial pressure, thick drainage, reduced smell or repeated infections, start with an ENT, who can examine the sinuses directly and treat structural causes. Elite ENT also offers allergy testing and allergy shots, so both sides can be addressed in one place.
Do I need a referral to see an ENT for sinusitis?
It depends on your insurance plan. Many HMO plans require a referral from your primary care doctor, while PPO plans often do not. Our team can help you check before your visit. Our guide to what an ENT visit costs explains copays, deductibles and referrals.
Stop Treating the Same Infection Over and Over
If you have had sinus symptoms for more than 12 weeks, or several infections this year, an ENT evaluation can show what is keeping them going. Call (602) 802-8240 or request an appointment. Our north Phoenix office offers nasal endoscopy and in-office balloon sinuplasty. Se habla español.
Medical Sources
- Sinus Infection Basics, Centers for Disease Control and Prevention
- Chronic sinusitis: Symptoms and causes, Mayo Clinic
- Deviated septum: Symptoms and causes, Mayo Clinic
- Nonallergic rhinitis: Symptoms and causes, Mayo Clinic
- Clinical Practice Guideline: Adult Sinusitis Update (2025), American Academy of Otolaryngology-Head and Neck Surgery
- Balloon Sinuplasty: Procedure and Recovery, Cleveland Clinic
This article is for general education and is not a substitute for a medical evaluation. If you have severe pain, trouble breathing, high fever, or sudden hearing loss, seek care right away.