Chronic Sinusitis: When Infection Becomes a Long-Term Problem

Written by Mr Tim Biggs | Consultant ENT Surgeon | Rhinology & Facial Plastics

Acute Versus Chronic Sinusitis: An Important Distinction

Sinusitis is one of the most common reasons people visit their GP, yet the term covers a wide spectrum of conditions with very different causes and treatments. Understanding the distinction between acute and chronic sinusitis is essential to understanding why they require different management strategies.

Acute sinusitis refers to inflammation of the sinus lining that arises suddenly, usually following a viral upper respiratory tract infection, and resolves within four weeks. The vast majority of cases are viral in origin, self-limiting, and require only symptomatic management. Antibiotics are rarely necessary and frequently overprescribed.

Chronic sinusitis, by contrast, is defined as sinonasal inflammation persisting for 12 weeks or more, despite treatment. By definition, something is maintaining the mucosal inflammation, and identifying and addressing that driver is the key to effective management.

Why Does Sinusitis Become Chronic?

Chronic sinusitis is not simply a prolonged version of acute infection. In most cases, it reflects a combination of factors that together impair the normal self-cleaning mechanism of the sinuses:

•        Anatomical obstruction of the sinus drainage pathways, often at the narrow channels of the osteomeatal complex, where the maxillary, anterior ethmoid, and frontal sinuses drain into the middle meatus

•        Mucociliary dysfunction, where the tiny hair-like cilia that move mucus out of the sinuses fail to function normally

•        Biofilm formation, where bacteria establish organised communities on the sinus mucosa that are resistant to antibiotics

•        Persistent low-grade bacterial or fungal colonisation

•        Underlying mucosal inflammation driven by allergy, aspirin sensitivity, or immune dysregulation

•        Nasal polyps obstructing sinus openings

In many patients, several of these factors coexist. A patient with a narrow osteomeatal complex, mild septal deviation, and allergic rhinitis may cope adequately until a viral infection tips them into a state of chronic mucosal inflammation that they cannot recover from without intervention.

Symptoms of Chronic Sinusitis

The clinical picture of chronic sinusitis is often more subtle than the dramatic facial pain and fever associated with acute infection. Typical symptoms include:

•        Persistent nasal obstruction or congestion

•        Mucopurulent nasal discharge, either from the nose or dripping down the back of the throat

•        Facial pressure or fullness, most commonly over the cheeks and forehead

•        Reduced or absent sense of smell

•        Fatigue, which is frequently underreported but very common

•        Cough, particularly at night, from postnasal drip irritating the larynx

•        Ear pressure or intermittent hearing changes

Pain is often less prominent in chronic sinusitis than patients expect. The absence of severe facial pain does not mean the sinuses are normal, and many patients with significantly abnormal CT scans have relatively mild pain as their dominant complaint.

Diagnosis: Endoscopy and Imaging

Diagnosis requires more than a clinical history. Nasal endoscopy is the essential first step: using a rigid endoscope in clinic, I can directly visualise the middle meatus, the critical drainage area for most of the sinuses, and identify mucosal oedema, purulent secretion, polyps, or anatomical obstruction.

A CT scan of the paranasal sinuses is obtained in most patients being considered for surgery. It maps the extent of mucosal disease, identifies the anatomical configuration of the sinus drainage channels, and highlights any variants that are relevant to surgical planning, such as an Onodi cell or a dehiscent lamina papyracea. CT is also essential for image-guided surgery in complex or revision cases.

Blood tests, allergy testing, and in selected cases ciliary function testing or immune workup may be arranged depending on the clinical picture.

Medical Treatment: Getting It Right

Before surgery is considered, medical treatment should be fully optimised. This means more than a single course of antibiotics and a nasal spray.

Nasal Corticosteroid Sprays

Daily high-dose nasal steroid spray, used with correct technique, reduces mucosal inflammation in the nose and at the sinus ostia. Consistent, long-term use is important, and technique matters: spray aimed at the lateral wall rather than the septum, head tilted slightly forward, sniff gently after spraying.

Saline Irrigation

High-volume nasal saline douching is an underused but genuinely effective adjunct. It mechanically clears mucus and inflammatory debris, improves mucociliary function, and enhances steroid penetration into the sinus cavities. I recommend it to all chronic sinusitis patients.

Antibiotics

Where there is evidence of active bacterial sinusitis, a targeted course of antibiotics is appropriate. Long-term low-dose macrolide antibiotics, used for their anti-inflammatory rather than antibiotic properties, may be considered in selected patients with refractory non-eosinophilic disease.

Allergy Management

Where allergic rhinitis is a contributing factor, optimising antihistamines and considering allergen immunotherapy is important both for symptom control and for reducing the inflammatory drive to the sinuses.

When Is Surgery the Answer?

Surgery becomes appropriate when symptoms remain significant despite optimised medical management sustained for at least 12 weeks, and when imaging confirms mucosal disease and sinus drainage obstruction amenable to surgical correction.

Functional endoscopic sinus surgery (FESS) opens the natural drainage pathways of the sinuses, removes chronically inflamed mucosa, and creates widely patent sinus cavities that ventilate properly and allow post-operative topical steroid to penetrate effectively. The goal is not to remove all sinus mucosa, but to restore the normal physiological conditions that allow the mucosa to recover and function.

FESS is performed entirely through the nostrils under general anaesthetic, as a day-case procedure, with no external incisions. I use image guidance for complex anatomy or revision cases. No nasal packing is used.

What Surgery Cannot Do

It is important to be clear with patients that surgery addresses the structural and drainage component of chronic sinusitis, but does not cure the underlying mucosal susceptibility. Patients who stop their nasal steroids and saline douching after surgery are significantly more likely to experience symptom recurrence. Surgery and medical treatment are partners, not alternatives, and long-term commitment to post-operative topical treatment is essential for durable results.

Arrange a Consultation

If you have been managing sinusitis symptoms for months without resolution, a specialist rhinological assessment is worthwhile. Nasal endoscopy and, where appropriate, CT imaging will clarify what is driving your symptoms and whether surgery, further medical optimisation, or a combined approach is most appropriate.

I see patients privately in Hampshire. To arrange a consultation, please contact my secretary Michele Hewlett. Fees are available at www.hampshireentclinics.co.uk.

Frequently Asked Questions

What is the difference between acute and chronic sinusitis?

Acute sinusitis lasts less than four weeks and is usually triggered by a viral upper respiratory infection. Chronic sinusitis is defined as sinonasal inflammation persisting for 12 weeks or more despite treatment, indicating that something structural or inflammatory is maintaining the condition.

What causes chronic sinusitis?

Chronic sinusitis results from a combination of factors including impaired sinus drainage due to anatomical obstruction, mucociliary dysfunction, biofilm formation, persistent low-grade infection, and in some cases immune dysregulation. Nasal polyps, septal deviation, and allergic rhinitis are common contributing factors.

How is chronic sinusitis diagnosed?

Diagnosis requires nasal endoscopy and CT scanning of the sinuses. Endoscopy allows direct visualisation of the middle meatus and sinus openings. CT defines the extent of mucosal thickening, identifies anatomical obstruction, and guides surgical planning.

When is surgery needed for chronic sinusitis?

Surgery is considered when symptoms are significant, have persisted for at least 12 weeks, and have failed to respond adequately to optimised medical treatment including topical steroids and saline douching. FESS opens the sinus drainage pathways and removes diseased mucosa to restore normal sinus ventilation.

Will chronic sinusitis come back after surgery?

Surgery is very effective at improving symptoms and quality of life, but ongoing medical management including nasal steroid sprays and regular saline douching is essential to maintain results. The underlying mucosal susceptibility does not disappear after surgery.

Where does Mr Tim Biggs treat chronic sinusitis?

Mr Biggs sees and treats chronic sinusitis patients privately in Hampshire.

How do I arrange a consultation?

Contact Michele Hewlett, Mr Biggs's secretary. Fees are available at www.hampshireentclinics.co.uk.