Recurrent Sinusitis or Recurrent Rhinitis? Why Many “Sinus Attacks” Are Not Sinus Infections

Many patients use the term “sinus infection” to describe repeated episodes of nasal blockage, facial pressure, thick mucus and feeling unwell. The problem is that these symptoms do not automatically mean the sinuses are infected.

A more accurate question is:

Is this recurrent acute sinusitis, or is it recurrent acute rhinitis?

That distinction matters. If the problem is recurrent acute rhinitis, then repeated antibiotics and limited sinus surgery are unlikely to help. If the problem is true recurrent acute sinusitis, then the pattern is usually more localised, more objective and more anatomically consistent.

The nose and sinuses are connected, but they are not the same structure. The lining of the nose can become inflamed from viral infections, allergy, smoke, pollution, climate change or irritants. That can produce congestion, mucus and pressure. This is rhinitis. Sinusitis implies inflammation within the sinus cavities themselves, usually supported by endoscopy or CT findings that match the symptoms.[1,2]

This is why nasal congestion is not always the same as nasal obstruction , and why repeated congestion should not automatically be interpreted as recurrent bacterial sinus infection.

Bilateral symptoms usually mean inflammation, not bacterial sinusitis

The left and right sinus cavities are not a single shared cavity. They are separate anatomical systems. When both sides become congested at the same time, with bilateral pressure and mucus production, it is very unlikely that both sinus systems have simultaneously developed a primary bacterial infection or identical anatomical blockage.

That pattern is much more consistent with a whole-nose inflammatory event. The common triggers are viral infection, allergic inflammation, irritant exposure, weather change, or a combination of these factors.[1,3]

This point is often missed. A patient may describe repeated episodes of “sinus” pressure, thick mucus and blockage. However, if the symptoms are synchronous and bilateral, the process is almost never a bacterial sinus infection. It is far more likely to be viral-allergic rhinitis, or a broader inflammatory reaction of the nasal lining.

Duration alone does not solve the problem. A rhinitis flare does not have to settle within a few days. Once the nasal lining is inflamed, the reaction can persist for weeks, in the same way that dermatitis can continue for weeks after a trigger has set it off. Under current rhinosinusitis definitions, disease is not called chronic until symptoms have persisted for 12 weeks or more.[1] Therefore, an episode lasting two, three or four weeks is not automatically bacterial sinusitis. The pattern, laterality, endoscopy and imaging matter more than duration alone.

What true recurrent acute sinusitis usually looks like

True recurrent acute sinusitis is uncommon, but it does exist.

The pattern is usually more convincing when episodes are:

• repeatedly localised to the same side or the same sinus region
• associated with lateralised facial pain or pressure rather than vague bilateral fullness
• associated with objective findings during the episode, such as endoscopic inflammation or CT opacification in the relevant sinus
• separated by near-normal or normal intervals between attacks
• sometimes linked to a reproducible drainage problem, dental source, barosinusitis or local anatomical issue

European guidance describes features that raise suspicion for acute bacterial rhinosinusitis, including fever, severe local pain, double worsening, raised inflammatory markers and unilateral disease.[1,4] These features are quite different from repeated bilateral congestion, mucus and pressure during viral or allergic flares.

True recurrent acute sinusitis is therefore a more localised and objective diagnosis. It should not be used as a default label for every recurrent nasal inflammatory event.

What the acute CT study showed

In a study of patients referred with suspected recurrent acute rhinosinusitis, the key question was simple: when these patients had their next “sinus attack,” would acute CT imaging actually show sinus disease?[2]

Most patients were convinced that their problem was sinusitis. Baseline CT scans were normal or near normal. Patients were then asked to return during an acute symptomatic episode for repeat assessment and imaging.[2]

The result was striking. Acute CT rarely confirmed true sinus disease. Only a very small proportion had objective changes consistent with recurrent acute rhinosinusitis. Most patients ultimately had rhinitis, headache/migraine or facial pain rather than recurrent sinus infection.[2]

This fits with clinical experience. A patient may feel pressure, congestion and mucus during an acute episode, but those symptoms can come from inflamed nasal mucosa, not infected sinus cavities.

Green or yellow mucus does not prove bacterial sinusitis

One of the most persistent myths is that green mucus means bacterial infection.

It does not.

Green or yellow mucus often reflects neutrophils and inflammatory proteins such as myeloperoxidase. Viral upper respiratory infections can produce thick, coloured mucus. Allergy can also make mucus production worse, especially when the nasal lining is already primed and reactive.[5]

A simple example is a viral cold in an allergic patient. The allergy has already made the nasal lining swollen and irritable. Then the viral infection arrives. The combined effect can be far worse than either trigger alone.

I often explain this to patients as pouring petrol on a fire. The virus is the spark. The allergic airway is the fuel. The result feels like “bad sinus,” but the mechanism is usually acute nasal inflammation, not bacterial sinus infection.

Why allergy makes viral events feel like sinusitis

Allergic rhinitis is not a trivial condition. Many patients adapt to a chronically inflamed nose and do not recognise their baseline allergy. They only notice the problem when a virus, weather shift or irritant exposure pushes the airway over its threshold.

This is why some patients say:

“Every cold goes to my sinuses.”

Often, what is actually happening is:

“Every cold causes a larger inflammatory rhinitis response because my nasal lining is already primed.”

The same person may have mild background nasal congestion, intermittent sneezing, postnasal drip, itchy eyes or seasonal flares, but they do not think of themselves as allergic. Then a viral infection causes a much stronger reaction: congestion, pressure, mucus and fatigue. That episode is then labelled “sinusitis.”

Minor CT changes can be incidental

Another problem is over-reading minor CT changes.

Small areas of mucosal thickening, small retention cysts or minimal sinus lining changes are common in people without sinus symptoms.[6] These findings do not automatically explain facial pressure or recurrent congestion.

A CT scan needs to be interpreted in context. The question is not, “Is there any mucosal thickening at all?” The real question is:

Do the radiology, symptoms, endoscopy and timing all point to the same disease process?

This is why ENT surgeons must review sinus CT scans, not just the report . A report may mention mucosal thickening, narrowing or anatomical variation, but those words do not prove that the finding is clinically meaningful. The scan needs to be reviewed against the patient’s symptom pattern.

If the symptoms are bilateral and recurrent, but the scan is normal or only shows minor incidental change, limited sinus surgery is usually a low-value intervention. Surgery cannot reliably treat a whole-airway inflammatory problem if the sinus cavities are otherwise functioning.

Why antibiotics are often the wrong response

Antibiotics are still commonly prescribed for acute “sinus” episodes. Sometimes they are appropriate. But in many patients with recurrent bilateral congestion, mucus and pressure, antibiotics are treating the wrong disease.

They may not improve the episode because the driver is viral or allergic inflammation. Repeated antibiotic use can also alter the microbiome, expose patients to adverse effects and reinforce the mistaken idea that every nasal inflammatory flare is bacterial sinusitis.

A more useful approach is to define the episode more carefully:

• Did symptoms start on one side or both sides?
• Is there severe unilateral pain?
• Is there fever?
• Is there “double worsening,” where the patient improves then deteriorates again?
• Does endoscopy or acute imaging show sinus inflammation that matches the symptoms?

If the pattern is bilateral and synchronous, bacterial sinusitis should be considered unlikely unless there are unusually strong objective findings to suggest otherwise.[1,4]

Treat the acute event as inflammation

If the episode is acute rhinitis, the treatment should focus on controlling inflammation quickly and effectively.

This is where nasal treatment is often underused. In dermatology, general practitioners are familiar with treating acute dermatitis intensively for a short period, sometimes with frequent topical corticosteroid application and occlusion to improve absorption. The nose rarely gets the same practical treatment plan.

For acute rhinitis flares, a short, focused period of intensive topical nasal therapy may be useful. Examples include combination corticosteroid and antihistamine sprays such as:

• fluticasone plus azelastine
• mometasone plus olopatadine

These sprays treat both allergic and inflammatory components. They are not antibiotics. They need to be used correctly, with good technique, and some patients need an acute action plan rather than occasional under-dosing.

Saline irrigation may also help by clearing mucus and reducing the burden of irritants. It is not a cure, but it can be useful during high mucus periods.

The aim is not to “open blocked sinuses.” The aim is to settle the inflamed nasal lining.

Modify the predisposition: treat the allergic airway

There is also a longer-term strategy. If allergy is part of the problem, the goal should not only be to treat each flare after it occurs. The goal should also be to reduce the predisposition to large inflammatory flares.

For some patients, that means allergen immunotherapy.

Allergen immunotherapy is different from standard allergy medication. Antihistamines and nasal steroid sprays suppress symptoms while they are being used. Immunotherapy aims to change the immune response to the relevant allergen over time.[7,8]

This is particularly relevant for patients who are “fine most of the time” but have large nasal reactions when a viral infection, pollen season or weather change occurs. Their airway may be sitting close to its inflammatory threshold. A virus then pushes it over the edge.

Treating the allergic component can reduce the background inflammatory load. It does not stop every virus, and it is not an acute rescue treatment. But in properly selected allergic patients, immunotherapy may reduce the tendency for viral and allergic triggers to combine into repeated severe nasal flares.[7,8]

This is why recurrent “sinus” episodes should prompt clinicians to ask whether the patient has undertreated allergic rhinitis. In many cases, the correct long-term plan is not sinus surgery. It is better allergy diagnosis, better rhinitis control and, in selected patients, early allergen immunotherapy in allergic rhinitis .

Prevention: reduce viral exposure and reduce airway reactivity

Prevention has two parts.

The first is simple viral prevention. Respiratory viruses spread through contact and close exposure. Hand washing, avoiding touching the face during viral seasons, and practical hygiene around young children remain useful. This is especially relevant for parents of children in daycare or school, and for younger adults with high social exposure.

The second is reducing baseline airway reactivity. If allergy is part of the problem, it needs to be treated properly. That may include regular intranasal therapy, allergen avoidance where practical, and in selected patients, allergen immunotherapy.[7,8]

A patient with an untreated allergic nose is more likely to experience exaggerated symptoms during viral infections. Treating the baseline allergic airway may reduce the size of the inflammatory response when the next virus arrives.

Where zinc fits

Zinc is relevant because many of these episodes are viral respiratory events, not bacterial sinus infections.

Zinc has plausible biological effects in viral respiratory infections. It is involved in immune function and may interfere with viral binding or replication in some settings.[9,10] The clinical evidence is not perfect, and it depends heavily on the form of zinc, dose, route and timing.

A BMJ Open rapid systematic review of adults found some evidence that zinc may prevent acute viral respiratory tract infection symptoms and shorten symptom duration, but certainty was limited by bias, small samples and heterogeneity.[9] A later Cochrane review was more conservative, finding little or no clear prevention benefit, possible shortening of cold duration when used for treatment, and more non-serious adverse events.[10]

The practical message is not that zinc is a cure for sinusitis. It is not.

The more reasonable message is:

For people with frequent viral-triggered nasal flares, maintaining adequate zinc intake may be one useful part of a prevention strategy.

For Australian adults, the usual recommended dietary intake is 14 mg/day for men and 8 mg/day for women. The adult upper level is 40 mg/day from total intake.[11] That matters because high-dose zinc, especially if used chronically, can cause nausea, gastrointestinal upset and copper deficiency.[11,12]

Short-term zinc lozenges used early in a cold are a different question from daily zinc supplementation. Some lozenge trials use higher doses for a limited number of days, but that is not the same as advising high-dose zinc every day for prevention.

A practical approach is:

• aim for adequate zinc intake through diet first
• consider a modest supplement if dietary intake is likely to be low
• avoid chronic zinc intake above the adult upper level unless medically supervised
• avoid intranasal zinc products because of safety concerns around smell disturbance
• be cautious with zinc if taking medications that interact with minerals, including some antibiotics

Zinc should be presented as a supportive measure, not a replacement for accurate diagnosis.

When to suspect it really is sinusitis

A true sinusitis episode is more likely when there is a unilateral pattern, severe localised pain, fever, worsening after initial improvement, or persistent objective sinus inflammation on endoscopy or CT.[1,4]

The diagnosis becomes less convincing when episodes are bilateral, synchronous, recurrent with viral or seasonal triggers, and associated with normal or near-normal CT scans between events.[2]

The key is not simply how long the symptoms last. Rhinitis events can last for weeks. The key is whether the pattern matches sinus disease.

Why surgery is low value in the setting of recurrent bilateral symptoms

Sinus surgery has a role when there is objective sinus disease and symptoms match the anatomy. It is not a general treatment for bilateral congestion, mucus and facial pressure in the setting of normal or near-normal sinus cavities.

Operating on normal sinuses does not treat allergy, viral susceptibility, mucosal hyperreactivity or migraine. In these patients, surgery can create a short-lived “honeymoon” effect because postoperative care temporarily changes topical treatment and nasal airflow, but it does not address the real driver.

This is the same principle discussed in functional nasal obstruction and low-value nasal surgery . surgery has value when the diagnosis, anatomy and objective findings align. It has low value when used to treat a mucosal inflammatory condition without objective sinus disease.

The better approach is to name the problem correctly:

This is often recurrent acute rhinitis, not recurrent acute sinusitis.

Once that is clear, the treatment plan becomes more rational: reduce viral exposure, treat baseline allergy, use topical anti-inflammatory therapy properly during flares, avoid unnecessary antibiotics, consider allergen immunotherapy in selected allergic patients, and reserve surgery for patients with objective, localised sinus disease.

Key message

Repeated episodes of bilateral congestion, mucus and facial pressure are commonly labelled “recurrent acute sinusitis.” In many patients, that label is wrong.

If both sides of the nose become congested at the same time, with mucus and pressure during viral, allergic or climate triggers, the most likely diagnosis is acute rhinitis. The sinuses may be innocent bystanders.

Correct diagnosis prevents low-value antibiotics, low-value surgery and years of treating the wrong condition.

References

1. Fokkens WJ, Lund VJ, Hopkins C, et al. European position paper on rhinosinusitis and nasal polyps 2020. Rhinology. 2020;58(Suppl S29):1-464.
2. Barham HP, Zhang AS, Christensen JM, Sacks R, Harvey RJ. Acute radiology rarely confirms sinus disease in suspected recurrent acute rhinosinusitis. Int Forum Allergy Rhinol. 2017;7(7):726-733.
3. Riley CA, Navarro AI, Trinh L, et al. What do we mean when we have a “sinus infection”? Int Forum Allergy Rhinol. 2023;13(2):129-139.
4. Jaume F, Valls-Mateus M, Mullol J. Common cold and acute rhinosinusitis: up-to-date management in 2020. Curr Allergy Asthma Rep. 2020;20(7):28.
5. Naclerio RM, Proud D, Lichtenstein LM, et al. Kinins are generated during experimental rhinovirus colds. J Infect Dis. 1988;157(1):133-142.
6. Razi B, Perkovic A, Alvarado R, Stroud A, Ho J, Kalish LH, et al. Sinus radiological findings in general asymptomatic populations: a systematic review of incidental mucosal changes. Otolaryngol Head Neck Surg. 2022;167(1):16-24.
7. Roberts G, Pfaar O, Akdis CA, et al. EAACI Guidelines on Allergen Immunotherapy: Allergic rhinoconjunctivitis. Allergy. 2018;73(4):765-798.
8. Dhami S, Nurmatov U, Arasi S, et al. Allergen immunotherapy for allergic rhinoconjunctivitis: a systematic review and meta-analysis. Allergy. 2017;72(11):1597-1631.
9. Hunter J, Arentz S, Goldenberg J, Yang G, Beardsley J, Myers SP, et al. Zinc for the prevention or treatment of acute viral respiratory tract infections in adults: a rapid systematic review and meta-analysis of randomised controlled trials. BMJ Open. 2021;11(11):e047474.
10. Nault D, Machingo TA, Shipper AG, Antiporta DA, Hamel C, Nourouzpour S, et al. Zinc for prevention and treatment of the common cold. Cochrane Database Syst Rev. 2024;5:CD014914.
11. National Health and Medical Research Council. Zinc: Nutrient Reference Values for Australia and New Zealand. Australian Government.
12. National Institutes of Health Office of Dietary Supplements. Zinc: Fact Sheet for Health Professionals. National Institutes of Health.

FAQs

Can sinus pressure happen without a sinus infection?

Yes. Facial pressure can occur from inflamed nasal mucosa, allergic rhinitis, viral rhinitis, migraine and other headache disorders. Pressure alone does not prove that the sinus cavities are infected.[1,2]

Does green or yellow mucus mean I need antibiotics?

No. Green or yellow mucus can occur during viral infections and allergic inflammatory flares. The colour often reflects inflammatory cells and enzymes in the mucus, not necessarily bacterial infection.[5]

If symptoms last for weeks, does that mean it is bacterial sinusitis?

No. Duration alone does not prove bacterial infection. A rhinitis flare triggered by a virus, allergy or irritant exposure can persist for weeks. Rhinosinusitis is generally not classified as chronic until symptoms have persisted for 12 weeks or more.[1]

Why are bilateral symptoms less likely to be bacterial sinusitis?

The left and right sinus cavities are separate anatomical systems. When both sides become congested at the same time, with bilateral pressure and mucus, the pattern is more consistent with a whole-nose inflammatory process such as viral or allergic rhinitis, rather than a primary bacterial infection affecting both sides simultaneously.[1,3]

When is recurrent acute sinusitis more likely?

Recurrent acute sinusitis is more likely when episodes are repeatedly localised to the same side or same sinus region, associated with severe localised pain, fever, double worsening, or objective sinus inflammation on endoscopy or CT.[1,4]

Can allergy make viral infections feel like sinusitis?

Yes. Allergy can prime the nasal lining so that a viral infection causes a larger inflammatory response. Patients may then experience marked congestion, mucus and pressure, even when the sinus cavities are not the main problem.[7,8]

Can allergen immunotherapy help recurrent “sinus” flares?

It may help selected patients when allergic rhinitis is part of the underlying predisposition. Immunotherapy is not an acute treatment, but it can reduce allergic airway reactivity over time and may reduce the tendency for viral and allergic triggers to combine into severe nasal flares.[7,8]

Does zinc treat sinusitis?

No. Zinc is not a treatment for sinusitis. Some evidence suggests zinc may reduce the duration of viral respiratory infections or modestly reduce viral respiratory events, but the evidence is mixed and zinc should be considered only as a supportive viral-respiratory strategy, not a substitute for diagnosis or medical care.[9,10]

Should I have sinus surgery for recurrent bilateral congestion and pressure?

Usually not if the sinus CT is normal or near normal and symptoms are bilateral. Sinus surgery is most useful when symptoms, endoscopy and imaging all show objective sinus disease in a consistent anatomical pattern.[2,6]