Sinusitis That Will Not Go Away or Keeps Coming Back
Why sinus symptoms persist for weeks or keep returning, what to check before another prescription, and the signs that need proper assessment.
Part of our Sinusitis condition guide.
Key fact: When sinusitis won't shift, the answer is almost never another antibiotic. Persistence usually means an ongoing driver keeping the lining inflamed—allergy, smoking, polyps, a structural narrowing, or a decongestant spray used too long.
Get Persistent Sinus Symptoms Assessed Online
Access Doctor is a UK online doctor and GPhC-registered pharmacy. A pharmacist independent prescriber will review your history without a GP appointment, and will tell you plainly where in-person examination is the better route.
View Sinusitis Treatments →How long is too long?
| Duration | What it usually means | What to do |
|---|---|---|
| Under 10 days | Normal course of acute sinusitis | Self-care. Not a treatment failure. |
| 10 days to 3 weeks | Slower than average but still within range | Consider a steroid nasal spray. Assessment reasonable. |
| 3 to 12 weeks | Overdue for review | Look for underlying drivers. See a clinician. |
| 12 weeks or more | Chronic rhinosinusitis—a different condition | Long-term anti-inflammatory approach. Often ENT. |
| 4+ episodes a year | Recurrent acute sinusitis | Find the underlying cause. |
2–3 wks
normal duration of an acute episode
12 wks
threshold for chronic sinusitis
3 months
of proper treatment before ENT referral
Persistent or recurrent?
These two patterns get lumped together and they need separating, because the causes and the management differ.
Persistent means symptoms that never fully clear. There is no genuinely well day. This points towards chronic inflammation.
Recurrent means repeated discrete episodes with complete recovery in between. Four or more a year is the formal definition of recurrent acute sinusitis. This points towards something that repeatedly lets infection take hold.
Be honest with yourself about the well periods. People often describe recurrent infections when what they actually have is constant low-grade symptoms with occasional flares. Ask whether your nose has genuinely been normal—smell intact, no blockage—at any point in the last three months. If not, this is persistent rather than recurrent, and our guide on acute vs chronic sinusitis is the relevant read.
Why sinusitis persists
Ongoing drivers keeping the lining inflamed
- Untreated allergic rhinitis—the single commonest reason. Continuous allergic inflammation keeps the drainage channels narrowed. Suspect it with sneezing, itchy eyes, clear discharge or a seasonal pattern.
- Smoking or vaping—direct chemical irritation that paralyses the tiny hairs clearing mucus. Sinusitis rarely settles properly while this continues.
- Nasal polyps—soft swellings physically obstructing drainage. Suspect with persistent blockage and long-standing loss of smell.
- Deviated septum—narrows one side. Suspect with consistently one-sided symptoms.
- Occupational irritants—dusts, solvents, fumes and chlorinated pools.
- Dry indoor air—particularly with winter central heating.
- Dental infection—an upper tooth root abscess driving one-sided maxillary sinusitis.
Or it was never quite what you thought
- Migraine—recurring facial pain with nasal symptoms during attacks, but a normal nose in between. See sinus headache vs migraine.
- Rebound congestion from decongestant overuse—covered below.
- Chronic rhinitis without sinusitis—nasal inflammation without true sinus involvement.
Why sinusitis keeps coming back
Recurrent episodes are a signal, not just bad luck. Something is making your sinuses easier to infect than most people's.
Untreated allergy
By far the highest-yield thing to address. Treating the allergy often reduces episodes more than treating each infection.
Nasal polyps
Obstruct drainage continuously, so each cold turns into sinusitis. Needs examination to diagnose.
Structural narrowing
Deviated septum or naturally narrow drainage openings. Suspect with repeated one-sided episodes.
Smoking or vaping
Impairs the clearance mechanism that would otherwise prevent infection taking hold.
Frequent viral exposure
Young children in the household, teaching or healthcare work. More colds means more chances.
Immune factors
Uncommon, but worth considering with unusually frequent or severe infections at multiple sites.
If antibiotics didn't help
This is worth treating as information rather than frustration.
A completed antibiotic course that produced no lasting improvement tells you something useful: the problem is probably not an active bacterial infection. Most likely it never was, since acute sinusitis is overwhelmingly viral, or the driver has shifted to inflammation that antibiotics can't touch.
Repeated courses are the pattern to break. People with persistent sinus symptoms often accumulate several antibiotic courses a year, each helping briefly or not at all. Each one carries side effects and adds resistance pressure without addressing the cause. If this describes you, the productive next step is investigation of what is driving the inflammation—not another prescription.
Before concluding the antibiotic failed, two practical checks are worth making. Did you take phenoxymethylpenicillin on an empty stomach as directed, since food substantially reduces absorption? And did you complete the full course? Both genuinely change the interpretation, and both are worth mentioning to your prescriber.
The decongestant trap
This deserves its own section because it is common, easily missed and entirely self-perpetuating.
Decongestant nasal sprays containing xylometazoline or oxymetazoline work by constricting blood vessels in the nasal lining. Used beyond about a week, the lining becomes dependent on that constriction. Each time the spray wears off, the vessels dilate more than before and the nose becomes more blocked than it originally was.
The natural response is to use the spray more often, which deepens the dependence. Weeks later, someone has a permanently blocked nose, is using a decongestant several times daily, and believes their sinusitis has become chronic.
If you've been using a decongestant spray for more than a couple of weeks, that alone may be your whole problem. Breaking the cycle means stopping the spray and accepting a few genuinely uncomfortable days while the lining recovers. A steroid nasal spray can help bridge that period. Speak to a pharmacist, who deals with this regularly.
What to check before another prescription
1
Are you still smoking or vaping?
The single biggest modifiable factor. Persistent sinusitis rarely resolves while this continues.
2
Have you been using a decongestant spray for weeks?
Check the box. If it's xylometazoline or oxymetazoline and you've used it beyond a week, this may be the answer.
3
Do you have untreated allergies?
Sneezing, itchy eyes, clear discharge, a seasonal pattern or a reaction to pets. Treating the allergy often does more than treating the sinuses.
4
Have you actually used a steroid spray properly?
Daily for at least two weeks, aimed outwards rather than at the septum, without sniffing hard. Most apparent failures are technique or consistency.
5
Are you rinsing with saline daily?
Rinsing, not a light spray. It's the best-evidenced home measure and the most commonly skipped.
6
Is it consistently one-sided?
If so, stop self-managing. One-sided persistent symptoms always warrant examination.
What actually helps persistent sinusitis
The approach shifts from treating an infection to reducing inflammation and restoring drainage, sustained over months rather than days.
- Steroid nasal spray, used daily and long term—the mainstay. Access Doctor supplies mometasone nasal spray for sinusitis and beclometasone nasal spray for sinusitis. Technique is covered in our mometasone guide.
- Daily saline irrigation—larger volume through a rinse pot, using cooled boiled or distilled water
- Treat the underlying driver—allergy, smoking, reflux or occupational exposure
- Stop any decongestant spray you've been using beyond a week
- Give it three months before judging. Chronic sinus inflammation improves slowly.
- Antibiotics only for genuine acute flares on top of the chronic picture, not as routine
When ENT referral is right
- Symptoms persisting despite around three months of proper medical treatment
- Suspected nasal polyps
- Consistently one-sided symptoms
- Complete loss of smell that isn't recovering
- Recurrent acute episodes with no identifiable cause
- Any red flag features
ENT can perform nasendoscopy—a thin camera examination of the nose—and arrange CT imaging. Neither is available in primary care, and both change what can be seen. Surgery is considered only where good medical treatment has genuinely failed.
Red flags needing assessment
Call 999 or go to A&E for swelling or redness around an eye, a bulging eye, double or reduced vision, a severe headache unlike your usual headaches, neck stiffness, drowsiness or confusion. These suggest infection spreading beyond the sinuses.
Arrange prompt GP review for consistently one-sided symptoms, blood-stained nasal discharge, persistent facial numbness, loosening of upper teeth, a lump on the face or in the neck, or persistent one-sided blockage that never alternates. These are uncommon and usually have benign explanations, but they need examining rather than waiting out.
What to do next
1
Work out your pattern
Persistent or recurrent? Count back honestly and note whether your nose has been genuinely normal at any point.
2
Run the checklist above
Smoking, decongestant overuse, untreated allergy, spray technique, saline rinsing. Most persistent cases have at least one of these.
3
Check for red flags
One-sided symptoms, blood-stained discharge, facial numbness or any eye involvement means assessment now.
4
Commit to proper treatment for three months
Daily steroid spray with correct technique plus daily saline. Half-hearted use for three weeks isn't a trial.
5
Ask about ENT if that fails
Three months of genuine treatment without benefit is the point at which examination and imaging become the useful next step.
Order a Steroid Nasal Spray for Persistent Sinus Symptoms
Complete a short online consultation and a GPhC-registered pharmacist independent prescriber will assess whether a steroid nasal spray is appropriate, and advise where in-person examination is needed instead. Dispensed from our UK pharmacy with discreet delivery.
View Mometasone Nasal Spray →Frequently Asked Questions
Why will my sinus infection not go away?
The commonest reasons are that an ongoing driver keeps the lining inflamed, or that the problem was never a straightforward infection. Untreated allergic rhinitis, smoking, nasal polyps, a deviated septum and overuse of decongestant sprays all keep symptoms going. It may also have moved from an acute infection into chronic inflammation, which needs an entirely different approach. Repeated antibiotic courses are rarely the answer when symptoms persist.
I have had a sinus infection for weeks. Should I worry?
Several weeks is longer than a typical acute episode but is not usually alarming in itself, since acute sinusitis can take two to three weeks and some people take longer. It does mean self-treatment has run its course and you should be assessed rather than continuing to wait. Seek help sooner if symptoms are consistently one-sided, if there is blood-stained discharge, or if you have any swelling around the eye or change in vision.
Why does my sinusitis keep coming back?
Recurrent episodes usually mean something is repeatedly allowing infection to take hold rather than each episode being bad luck. The commonest underlying factors are untreated allergic rhinitis, smoking or vaping, nasal polyps, a deviated septum narrowing one side, and dental problems in the upper teeth. Four or more episodes in a year with complete recovery in between is defined as recurrent acute sinusitis and warrants looking for the underlying cause rather than treating each episode separately.
Why did antibiotics not clear my sinus infection?
Most often because the problem was not bacterial. Acute sinusitis is overwhelmingly viral, and by the time symptoms have persisted for weeks the driver is usually inflammation blocking drainage rather than an active infection. Antibiotics do nothing for swelling. A course that produced no lasting benefit is useful diagnostic information in itself, and points towards a steroid nasal spray and investigation of underlying causes rather than another prescription.
Can a decongestant spray make sinusitis worse?
Yes, and this is a genuinely common and often missed cause of persistent blockage. Decongestant sprays used for longer than about a week cause rebound congestion, where the nasal lining becomes more swollen each time the spray wears off. People then use it more often, which worsens the cycle. If you have been using a decongestant spray for weeks, that alone may explain your persistent symptoms, and stopping it is the treatment.
When should persistent sinusitis be referred to ENT?
Referral is usually considered where symptoms persist despite around three months of proper medical treatment with a steroid nasal spray and saline irrigation, where nasal polyps are suspected, where symptoms are consistently one-sided, or where there are red flag features. An ENT specialist can examine the nose with a nasendoscope and arrange a CT scan, neither of which is available in primary care.
What are the warning signs with long-lasting sinus symptoms?
Seek emergency care for swelling or redness around an eye, a bulging eye, double or reduced vision, a severe headache unlike your usual ones, neck stiffness or confusion. Arrange prompt GP review for consistently one-sided symptoms, blood-stained nasal discharge, persistent facial numbness, loosening upper teeth, or a lump on the face or in the neck. These features are uncommon and usually have benign explanations, but they should always be examined rather than waited out.
Completing the treatment
For persistent sinus symptoms the mainstay is a steroid nasal spray used consistently alongside daily saline rinsing, with antibiotics reserved for genuine acute flares. Access Doctor supplies both after a short online consultation reviewed by a GPhC-registered pharmacist independent prescriber. See the full range on the sinusitis treatment page.
Steroid spray · Rx
Mometasone Nasal Spray for Sinusitis
Mainstay for persistent sinus inflammation, used daily.
View product →Steroid spray · Rx
Beclometasone Nasal Spray for Sinusitis
Alternative long-established steroid nasal spray.
View product →Antibiotic · Rx
Phenoxymethylpenicillin for Sinusitis
For genuine acute bacterial flares, not routine use.
View product →Antibiotic · Rx
Clarithromycin Tablets for Sinusitis
Alternative where penicillin cannot be used.
View product →References
- NICE Clinical Knowledge Summaries. Sinusitis. cks.nice.org.uk
- National Institute for Health and Care Excellence. Sinusitis (acute): antimicrobial prescribing (NG79). nice.org.uk
- NHS. Sinusitis (sinus infection). nhs.uk
- NHS. Nasal polyps. nhs.uk
- European Position Paper on Rhinosinusitis and Nasal Polyps (EPOS). rhinologyjournal.com
- NICE. Suspected cancer: recognition and referral (NG12). nice.org.uk
- ENT UK. Chronic rhinosinusitis patient information. entuk.org
Medical disclaimer: This article is for informational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional for diagnosis and treatment. In a medical emergency, call 999.