How long does sinusitis last, and when is it chronic?

Most acute sinusitis follows a cold and improves within two to three weeks without antibiotics. Symptoms lasting between four and twelve weeks are described as subacute, and beyond twelve weeks the condition is classed as chronic. That twelve-week threshold matters because it changes the thinking: chronic sinusitis is usually driven by ongoing inflammation, allergy, nasal polyps, or a structural narrowing rather than a persistent bacterial infection. Knowing exactly how long your symptoms have run, and whether they ever fully clear, is one of the most useful things you can bring to the appointment.

Do I need antibiotics for sinusitis?

Usually not. The great majority of acute sinusitis is viral and settles on its own with simple measures such as saline rinses, decongestants for a short period, and pain relief. Antibiotics are considered when symptoms are severe, are lasting well beyond the expected course, or worsen after initially improving. For chronic sinusitis, repeated antibiotic courses often disappoint because the underlying problem is inflammation rather than infection. If you have had several courses with no lasting benefit, that itself is useful information and a reason to look for a different cause.

What is the correct way to use a steroid nasal spray?

Technique makes a real difference and is commonly done wrong. Broadly, blow your nose first, tilt your head slightly forward rather than back, and use the opposite hand to the nostril so the spray is aimed outwards towards the ear rather than at the middle wall of the nose. Do not sniff hard after spraying, as that pulls the medicine straight down the throat. Steroid sprays also need consistent daily use over weeks to show their benefit. Ask your doctor or pharmacist to watch you use yours — a small correction often unlocks the effect.

Could my chronic sinusitis be caused by allergies?

Frequently, yes. Allergic rhinitis is one of the commonest drivers of persistent sinus inflammation, and chronic sinusitis often travels alongside hay fever, asthma, and nasal polyps. Where allergy is the underlying driver, treating it — through avoidance where practical, antihistamines, steroid nasal sprays, or sometimes immunotherapy — tends to help far more than repeated antibiotics. This is why your doctor may ask about seasonal patterns, pets, dust, and your asthma history. If allergy has never been explored and your symptoms are persistent, it is a reasonable thing to raise.

Preparing for Appointments with Chronic Sinusitis

Quick answer: Sinusitis is inflammation of the linings of the sinuses, the air-filled spaces around the nose and eyes, causing a blocked or runny nose, facial pain or pressure, reduced sense of smell, and sometimes headache. Most episodes follow a cold and clear within two to three weeks without antibiotics. It is called chronic when symptoms persist beyond about twelve weeks, and at that point the appointment shifts from treating an infection to finding out why the inflammation is not settling — allergy, nasal polyps, or structural narrowing are common answers. Bring a timeline of how long symptoms have lasted and what you have already tried.

Weeks of a blocked nose, facial pressure, and a dulled sense of smell wear people down, and the frustration is often that repeated courses of antibiotics have not helped. That is actually the key insight: once sinusitis becomes chronic, it is usually an inflammation problem rather than a persistent infection, so the treatments that work are different. This guide helps you bring the timeline and detail that let your doctor move past another antibiotic prescription and towards the causes worth investigating — and to use nasal treatments correctly, which is where most of the benefit lies.

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Acute or Chronic?

Pattern	What it means
Under 4 weeks, after a cold	Acute sinusitis — usually viral and settles without antibiotics
4 to 12 weeks	Subacute — worth reviewing what is prolonging it
Beyond 12 weeks	Chronic sinusitis — investigate allergy, polyps, or structural causes
Recurring several times a year	Recurrent acute sinusitis — a pattern worth specialist review

Severe headache with a swollen or red eye, vision changes, confusion, or a very high fever needs urgent assessment, as infection can rarely spread beyond the sinuses. Persistent symptoms on one side only, or any nosebleeds with blockage, also warrant prompt review by an ENT specialist. Allergy is a frequent driver and may involve an allergist.

What to Track Before Your Appointment

How long symptoms have lasted: continuous weeks, or clearing and returning — the distinction shapes the diagnosis
Which symptoms dominate: blockage, discharge, facial pain, or loss of smell
One side or both: persistent one-sided symptoms are always worth flagging
Allergy and asthma history: hay fever, asthma, or aspirin sensitivity often travel with chronic sinusitis
What you have tried: nasal sprays, rinses, antibiotics — and exactly how you used them. A appointment notebook of symptom weeks and treatments prevents repeating what has already failed

Treatment and What Actually Helps

For chronic sinusitis, the mainstays are saline nasal rinses and steroid nasal sprays used correctly and consistently over weeks — technique matters more than most people realise, and a sprayed dose aimed wrongly does little. Antibiotics have a limited role once symptoms are chronic, since the problem is usually ongoing inflammation rather than infection. Investigating and treating underlying allergy makes a substantial difference for many. If symptoms persist, an ENT specialist may examine the nose with a small camera, arrange a CT scan, and discuss surgery to improve drainage.

Helpful for this appointment

appointment notebook — a symptom-and-treatment diary showing which sprays and rinses you have actually tried, and for how long
weekly pill organiser — an organiser supports the daily nasal-spray routine that only works when used consistently for weeks

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Questions to Ask Your Doctor

Is my sinusitis chronic, and what is likely driving it?
Am I using my nasal spray with the right technique?
Should I be tested for allergies, or checked for nasal polyps?
Do I actually need antibiotics, given how long this has gone on?
When would a CT scan or referral to ENT be the right next step?

Regional Notes

Singapore: Managed by GPs and ENT specialists; nasal endoscopy, allergy testing, and sinus surgery are available at hospitals with subsidies.

Australia: GP-led with ENT referral; nasal sprays are widely available and some are PBS-subsidised, with allergy testing accessible via referral.

United States: Managed by primary care, ENT, and allergy specialists; coverage for imaging, allergy testing, and sinus surgery depends on your plan.

KEY SOURCES

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Medical Disclaimer: This guide is for informational and preparation purposes only. It does not constitute medical advice, diagnosis, or treatment. Always consult a qualified medical professional for guidance specific to your situation.