Is Sinusitis Contagious? What Spreads, What Does Not, and For How Long
The short answer is no—but the virus that started it is a different matter.
Part of our Sinusitis condition guide.
The headline: Sinusitis is your own sinuses being blocked and inflamed—and blockage can't be caught. What spreads is the cold virus that caused it, and you're most infectious in the first few days, before the sinusitis develops. By the time your face aches, the contagious part is largely over.
The short answer
| Question | Answer |
|---|---|
| Can someone catch sinusitis from me? | No |
| Can someone catch the virus that caused my sinusitis? | Yes, early on |
| If they catch it, will they get sinusitis? | Probably not—most people just get a cold |
| Is bacterial sinusitis contagious? | No |
| Is chronic sinusitis contagious? | No |
| Am I still infectious once my face hurts? | Usually barely, or not at all |
Why sinusitis itself can't spread
It helps to be precise about what sinusitis actually is.
Your sinuses are air-filled cavities in the bones of your face, each draining into the nose through a channel only a few millimetres across. Sinusitis is what happens when the lining swells, those channels close, and mucus is trapped in a sealed space. Pressure builds, and that pressure is the facial pain.
That's a plumbing problem in your own head. There's no mechanism by which a blocked drainage channel can be transferred to someone else. What you can pass on is the thing that caused the swelling in the first place—usually a common cold virus.
A useful way to think about it. If you sprain your ankle running, nobody can catch your sprain. They could catch the same bus that made you run for it. The virus is the bus. The sprain is yours.
When you're actually infectious
This is the part that surprises people, and it's genuinely useful to know.
1
Days 1–3: most infectious
The cold virus is replicating hard. Runny nose, sneezing, sore throat. You're shedding plenty of virus—and at this stage you don't have sinusitis at all.
2
Days 4–7: declining
Still some virus around, but less. This is when sinus symptoms often begin to appear as the drainage channels close.
3
Days 7–10: largely past it
The original virus has usually been cleared or nearly so. Facial pressure and blockage may be at their worst. You feel dreadful and are barely infectious.
4
Beyond day 10: not infectious
What remains is inflammation and blockage, not active viral infection. This is exactly the point at which treatment starts being considered.
Bacterial sinusitis and antibiotics
A minority of sinusitis becomes bacterial. People often assume this makes them more infectious. It doesn't.
The bacteria involved—usually Streptococcus pneumoniae, Haemophilus influenzae or Moraxella catarrhalis—are typically organisms already living harmlessly in your own nose and throat. They haven't been caught from anyone. They've simply multiplied in mucus that couldn't drain.
Being given antibiotics doesn't mean you're infectious. It means a sealed, mucus-filled cavity gave bacteria you already carried a place to multiply. There's no need to isolate yourself, and no need to tell people you're contagious.
Our guide on whether a sinus infection is bacterial or viral explains how that distinction is actually made.
Chronic sinusitis and allergy
Sinus symptoms lasting beyond twelve weeks are classed as chronic rhinosinusitis, and none of the things driving it are transmissible:
- Ongoing inflammation of the sinus lining
- Allergy, such as house dust mite or pollen sensitivity
- Nasal polyps, which physically obstruct drainage
- A deviated septum or other structural narrowing
- Environmental irritants such as smoke or occupational dust
Someone with chronic sinusitis poses no infection risk to anybody, indefinitely. See acute vs chronic sinusitis for the distinction.
Work, school and nursery
| Situation | Guidance |
|---|---|
| Adult, sinusitis, no fever, feels functional | Fine to work |
| Adult, first 2–3 days of the original cold | Work from home if you can—this is the infectious window |
| Adult with a fever | Stay home until it settles |
| Adult working with vulnerable people | Follow your workplace policy, which will be stricter |
| Child, no fever, well enough to join in | School or nursery as normal |
| Child with a fever or clearly unwell | Keep home until better |
There's no official exclusion period for sinusitis or for colds. UK guidance doesn't require children to be kept off school for either, and there's no set number of days you must stay away from work. The test is how you feel and whether you have a temperature, not the diagnosis.
Sinusitis can, however, be genuinely disabling for a few days—the facial pressure, poor sleep and difficulty concentrating are real. Being unwell enough to need time off is a separate question from being infectious, and a perfectly legitimate one.
How the virus actually spreads
When transmission does happen in that first week, it happens in three ways:
Droplets
Coughs and sneezes launch virus-containing droplets into the air and onto nearby surfaces.
Hands and surfaces
You touch your nose, then a door handle. Someone else touches it, then their eyes. This is the commonest route by some distance.
Close contact
Kissing, sharing drinks or cutlery, prolonged conversation at close range.
Cold viruses can survive on hard surfaces for hours, which is why hand hygiene does more than avoiding people.
Protecting the people around you
- Wash your hands properly and often—soap and water for twenty seconds, especially after blowing your nose
- Catch it in a tissue and bin it immediately, rather than pocketing it
- Sneeze into your elbow if no tissue is to hand, never your palm
- Clean shared touchpoints—door handles, taps, light switches, keyboards, phones
- Don't share towels, cups, cutlery or water bottles while you have an active cold
- Keep your distance from anyone vulnerable—newborns, people on chemotherapy, anyone immunosuppressed, the very elderly
These matter most in week one—the period when you may not even realise you're becoming ill. By the time you're searching whether sinusitis is contagious, the window has usually closed.
If someone at home has it
You can't catch their sinusitis. You may catch the virus that caused it, if you're in the first week.
If you then develop a cold, most likely it stays a cold. Some people are more prone to sinusitis after a cold—those with allergic rhinitis, a deviated septum, nasal polyps, or a history of recurrent episodes.
Households with young children often experience what feels like one endless illness through winter. Usually that's several different viruses in succession rather than one thing being passed back and forth. Our guide on sinusitis vs cold vs COVID helps sort out which is which.
Sinus Symptoms Past 10 Days?
If sinus symptoms have persisted beyond 10 days without improving, Access Doctor's GPhC-registered pharmacist independent prescribers can assess you online and decide whether treatment is appropriate. For adults aged 18 and over.
View Sinusitis Treatments →What to do about your own symptoms
Since contagion isn't the issue, the useful question is what actually helps.
| Stage | What helps |
|---|---|
| First 10 days | Saline rinsing, regular paracetamol or ibuprofen, sleeping propped up, fluids. Antibiotics do nothing here |
| Past 10 days, not improving | A steroid nasal spray is usually the appropriate next step |
| Worsening after initial improvement, or systemically unwell | Assessment, and possibly an antibiotic |
| Beyond 12 weeks | GP review—this is chronic sinusitis and needs a different approach |
Our guides on relieving sinus pressure at home and steroid spray vs antibiotics cover each stage. Where treatment is appropriate, Access Doctor supplies mometasone nasal spray for sinusitis and beclometasone nasal spray for sinusitis, with phenoxymethylpenicillin where a bacterial infection is genuinely likely.
Seek urgent medical attention for swelling or redness around an eye, a bulging eye, vision changes, a severe headache unlike your usual ones, neck stiffness, or confusion. These are uncommon complications of sinusitis and need immediate assessment.
Frequently Asked Questions
Is sinusitis contagious?
Sinusitis itself is not contagious. It is inflammation and blockage of your own sinuses, and blockage cannot be passed to anyone. What can spread is the virus that caused it in the first place. Most sinusitis starts as an ordinary cold, and cold viruses are contagious. So someone can catch the virus from you, but what they get is a cold. Whether that cold goes on to become sinusitis depends on them, not on you.
How long is sinusitis contagious for?
You are generally most infectious in the first few days of the original cold, before the sinusitis has even developed, and for roughly the first week. By the time facial pressure and blockage have set in, usually around day five to ten, the infectious period is largely over. This is the part people find counterintuitive: you are typically least contagious at the point you feel worst.
Is bacterial sinusitis contagious?
No. The bacteria involved in a bacterial sinus infection are usually organisms already living harmlessly in your own nose and throat, which have multiplied because mucus became trapped behind a blocked sinus. They are not transmitted to other people in the way a cold virus is. Being prescribed an antibiotic does not mean you have become infectious.
Can I go to work with sinusitis?
Usually yes, if you feel well enough. Sinusitis is not a reason to stay away from work on infection-control grounds, particularly once you are past the first week and the original cold has settled. Stay home if you have a fever, feel genuinely unwell, or are in the first few days of a cold when you are most likely to pass the virus on. If you work with vulnerable people, follow your workplace policy.
Can my child go to school or nursery with sinusitis?
Children can usually attend if they are well enough to take part and have no fever. UK guidance does not require children to stay away from school for a cold or for sinusitis, and there is no recommended exclusion period. Keep them home if they have a temperature, are too unwell to cope with the day, or are in the first couple of days of a heavy cold. Send them back once they are themselves again.
Can you catch sinusitis from kissing or sharing a drink?
You cannot catch sinusitis, but you can catch the virus that leads to it, and close contact makes that more likely. Cold viruses spread through droplets from coughs and sneezes and by touching a contaminated surface then your own eyes, nose or mouth. Sharing drinks, kissing and close conversation all create opportunities for that. The other person would develop a cold, which may or may not progress.
Is chronic sinusitis contagious?
No. Chronic sinusitis, meaning symptoms lasting beyond twelve weeks, is driven by ongoing inflammation, allergy, structural problems such as a deviated septum, or nasal polyps. None of those can be transmitted. Someone with chronic sinusitis is not a risk to anyone around them, and can live and work normally without any infection-control precautions.
How do I avoid passing it on?
The measures that reduce spread are the ordinary ones and they work: wash your hands well and often, catch coughs and sneezes in a tissue and bin it straight away, avoid touching your face, and clean shared surfaces such as door handles, taps and keyboards. Do not share towels, cups or cutlery while you have an active cold. These matter most in the first week, when the virus is circulating.
Completing the treatment
Once you're past the infectious phase, the question becomes whether the blockage needs treating. Access Doctor supplies steroid nasal sprays and, where genuinely indicated, antibiotics, to adults following a short online consultation reviewed by a GPhC-registered pharmacist independent prescriber. See the options on the sinusitis treatment page.
Steroid spray · Rx
Mometasone Nasal Spray for Sinusitis
For sinus symptoms persisting past day 10.
View product →Steroid spray · Rx
Beclometasone Nasal Spray for Sinusitis
Twice-daily alternative steroid nasal spray.
View product →Antibiotic · Rx
Phenoxymethylpenicillin for Sinusitis
Where a bacterial sinus infection is genuinely likely.
View product →Antibiotic · Rx
Doxycycline Capsules for Sinusitis
Alternative where penicillin cannot be used.
View product →References
- NHS. Sinusitis (sinus infection). nhs.uk
- NHS. Common cold. nhs.uk
- NHS. Is my child too ill for school? nhs.uk
- UK Health Security Agency. Health protection in children and young people settings, including education. gov.uk
- National Institute for Health and Care Excellence. Sinusitis (acute): antimicrobial prescribing (NG79). nice.org.uk
- NICE Clinical Knowledge Summaries. Sinusitis. cks.nice.org.uk
- NHS. How to wash your hands. nhs.uk
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.