Sinusitis is one of those conditions that sounds simple until you actually have it. What starts as “just a cold” can turn into blocked breathing, facial pressure, thick mucus, poor sleep, a dulled sense of smell and that washed-out feeling that makes normal life harder than it should be.
For some people, sinusitis lasts a few days and settles with rest and self-care. For others, it keeps coming back or drags on for weeks, becoming less like an infection and more like an ongoing inflammation problem that affects work, mood and day-to-day comfort.
This guide explains what sinusitis is, what it feels like in real life, what usually causes it, how long it tends to last, what actually helps, when antibiotics may or may not be useful, and when it makes sense to see a pharmacist, GP or ENT specialist in the UK.
If you are exploring ENT symptoms more broadly, you may also want to read our ENT guides, our article on when to see a pharmacist instead of a GP, and our overview of NHS vs private healthcare in the UK.
What is sinusitis?
Sinusitis is inflammation and swelling of the lining of the sinuses. The sinuses are small air-filled spaces in the bones around your nose, cheeks, eyes and forehead. Normally, they drain mucus into the nose without you noticing. But when the lining becomes swollen, drainage is blocked. Mucus builds up, pressure increases, and symptoms begin.
Many people think of sinusitis as an infection only. Sometimes it is. But especially when symptoms last a long time, sinusitis is often more accurately a problem of ongoing inflammation, sometimes linked with allergies, nasal polyps, asthma, smoking, structural nasal issues or repeated infections.
What sinusitis feels like in real life
Sinusitis does not feel the same for everyone. One person gets mainly pressure and headache. Another gets thick post-nasal drip and coughing. Another feels as if they cannot breathe properly through their nose and cannot taste food properly.
Example 1: You develop a cold, start to improve, then suddenly feel blocked again. Your cheeks ache, bending forward makes your face feel heavy, and your mucus becomes thick. That is a very common sinusitis story.
Example 2: You wake up with a permanently blocked nose, a reduced sense of smell and constant throat clearing for months. That pattern is more suggestive of chronic rhinosinusitis than a simple short infection.
Example 3: You keep getting “sinus headaches”, but the real issue is ongoing congestion, poor sinus drainage and inflammation that never fully settles.
Example 4: You can breathe through one side of your nose but not the other, especially at night, and every cold turns into a miserable sinus flare-up. In that case, the background issue may not be infection alone. A deviated septum, allergy or polyp problem may be part of the picture.
Common sinusitis symptoms
The classic symptoms are not just pain. In fact, some people have very little pain but still have clear sinus inflammation.
Common symptoms include:
- a blocked or stuffy nose
- thick yellow or green nasal discharge
- mucus running down the back of the throat
- facial pressure, fullness or discomfort
- reduced or lost sense of smell
- headache that feels worse when bending forward
- tooth or upper jaw discomfort
- cough, especially at night
- bad breath
- feeling tired or generally unwell
Children may show some of the same signs, but adults are more likely to describe facial pressure, smell loss and post-nasal drip.
Acute sinusitis vs chronic sinusitis
This distinction matters because the treatment approach is not quite the same.
Acute sinusitis usually comes on over days, often after a cold or upper respiratory infection. It generally improves within a few weeks, even if it feels horrible at the time.
Chronic sinusitis, often called chronic rhinosinusitis, means symptoms continue for more than 12 weeks. At that point, the issue is often less about a short infection and more about persistent inflammation, with or without nasal polyps.
A simple way to think about it is this: acute sinusitis is usually a bad episode. Chronic sinusitis is a longer-running pattern.
What causes sinusitis?
The most common trigger is a viral infection, such as a cold. That is one reason antibiotics are often not needed in the early stages. But viral infection is only part of the picture.
Sinusitis may also be linked with:
- allergies such as hay fever
- ongoing nasal inflammation
- nasal polyps
- a deviated septum or other structural narrowing
- smoking or exposure to irritants
- asthma
- dental infections in some cases
- repeated respiratory infections
In chronic cases, the problem is often not that there is one stubborn germ “stuck in the sinuses”, but that the whole nasal-sinus system stays inflamed and drains poorly.
Does green mucus mean you need antibiotics?
Not necessarily. This is one of the most common misunderstandings.
Thick yellow or green mucus can happen with viral infections as well as bacterial ones. It does not automatically mean you need antibiotics. That is why UK guidance is cautious about antibiotic prescribing for acute sinusitis. Many people improve without them, and unnecessary antibiotic use brings side effects and contributes to resistance.
What matters more is the overall picture: how long symptoms have lasted, how severe they are, whether they are getting worse instead of better, and whether there are red flags.
How long does sinusitis usually last?
Mild acute sinusitis often improves within 2 to 3 weeks. Some cases settle sooner. Others linger but still improve without antibiotics.
If symptoms are still clearly ongoing beyond 12 weeks, that moves into chronic rhinosinusitis territory and usually needs a different kind of review and management plan.
When sinusitis can usually be managed at home
If your symptoms are typical, not severe, and you do not have worrying red flags, home treatment is often the right place to start. That may feel frustrating when you feel dreadful, but in many cases time and supportive care are exactly what make the difference.
What often helps most is not one miracle product, but a combination of sensible measures used consistently for several days.
These include rest, hydration, pain relief if suitable for you, avoiding smoking, and using saline rinses or salt-water nasal cleansing to help shift mucus and reduce congestion.
What actually helps sinusitis
People often want the fastest fix possible, but sinusitis usually improves through steady symptom relief rather than one dramatic treatment.
Saline rinses or salt-water nasal cleansing
This is one of the most practical, underrated treatments. Saline can help wash out mucus, reduce crusting and make the nose feel less congested. It is especially helpful when mucus is thick or when symptoms are lingering.
Pain relief
If facial discomfort, headache or pressure are the main problem, standard pain relief may help, provided it is suitable for you.
Steam and warm showers
Some people find warm steam soothing, although it is not a cure. It may help loosen secretions and make you feel more comfortable for a while.
Rest and fluids
Basic, yes, but still useful. When the lining of the nose and sinuses is inflamed, general recovery measures matter more than people think.
Nasal steroid sprays
These are often more useful in lingering or chronic inflammatory sinus symptoms, especially if allergy or nasal polyps may be involved. They do not work instantly. Used properly, they often help over time rather than overnight.
What usually does not help as much as people think
Sinusitis is a condition where people often buy several products at once and hope one of them will be the answer. Sometimes that leads to overdoing it or relying on short-term fixes.
Things to be careful about include overusing decongestant nasal sprays, expecting antibiotics to solve every case, and switching treatments too quickly before they have had a real chance to work.
If you use a decongestant spray for too long, your nose can end up more blocked again afterwards. That rebound cycle catches a lot of people out.
When antibiotics may be considered
Antibiotics are sometimes appropriate, but they are not the default answer for most sinus infections.
They are more likely to be considered if you are very unwell, symptoms are severe, symptoms are not improving in the expected time frame, or there are signs suggesting a more significant bacterial infection. In some cases, a delayed or back-up prescription may be discussed.
This can be frustrating if you feel awful and want something stronger, but the reason for caution is sound: most acute sinusitis gets better without antibiotics, and using them when they are unlikely to help brings downsides without much benefit.
When sinusitis needs medical attention
You do not need to see a GP for every blocked nose and every miserable cold. But sinusitis should be assessed if symptoms are severe, getting worse, lasting longer than expected, or coming back again and again.
It is also worth speaking to a clinician if your symptoms have not started to improve after about 7 to 10 days, or if you are having frequent episodes that are affecting your life.
Red flags: when to get urgent help
Sinusitis complications are uncommon, but they do happen. Because the sinuses sit close to the eyes and brain, certain symptoms should never be ignored.
Seek urgent medical help if you have:
- swelling or redness around the eye
- vision changes or double vision
- severe facial swelling
- confusion, drowsiness or a very severe headache
- a high fever with rapidly worsening symptoms
- symptoms that feel dramatically more severe than an ordinary sinus infection
Chronic sinusitis: when it stops being “just a sinus infection”
Chronic sinusitis is different from a one-off bad spell. People often describe it as living with a permanently inflamed nose and face. They may not feel acutely ill, but they never feel fully clear either.
Typical features include long-term nasal blockage, reduced smell, ongoing discharge or post-nasal drip, facial pressure and repeated flare-ups. Some people also have nasal polyps, asthma or allergies in the background.
This is where treatment becomes more strategic. Instead of simply trying to “clear an infection”, the focus is usually on reducing inflammation, improving drainage and working out what is keeping the sinuses irritated.
Could it be something other than sinusitis?
Yes. Not every facial headache or pressure problem is sinusitis.
Migraine is often mistaken for “sinus headache”, especially when it comes with facial pressure, congestion or watering eyes. Allergic rhinitis can also cause chronic stuffiness without true sinus infection. Dental problems, nasal polyps and structural nasal issues may overlap with or mimic sinus symptoms too.
If you keep treating yourself for sinusitis but the story does not quite fit, that is a good reason for review.
What a GP or specialist may do
A GP will usually diagnose sinusitis from your symptoms and by examining you. In persistent or complicated cases, they may recommend medical treatment, review possible allergy or inflammatory triggers, or refer you to ENT.
ENT specialists may use a small camera to look inside the nose more closely. In longer-term or more complex cases, scans may be considered. That is more common when symptoms persist despite treatment, when polyps are suspected, or when surgery is being considered.
When surgery may be discussed
Most people with sinusitis do not need surgery. But some do, especially when symptoms continue despite good medical treatment, or when nasal polyps or structural problems are making drainage and breathing difficult.
Endoscopic sinus surgery is designed to improve drainage and access within the sinuses. It is not usually the first step. It is more often part of the conversation after medicines and nasal treatment have not been enough.
What to avoid
With sinusitis, the biggest problems often come from either under-treating persistent inflammation or over-treating short-lived symptoms with the wrong things.
Try to avoid:
- assuming every case needs antibiotics
- using decongestant sprays for too many days in a row
- smoking, which can worsen irritation and recovery
- ignoring repeated episodes that keep returning
- assuming all “sinus headaches” are definitely sinusitis
- waiting months with long-term smell loss, blockage and post-nasal drip without getting checked
Questions people often ask
Is sinusitis contagious?
Sinusitis itself is not usually something you “catch” directly in the way you catch a cold. But the viral infection that triggered it may be contagious.
Can sinusitis cause tooth pain?
Yes. Pressure in the maxillary sinuses can sometimes cause pain that feels like it is coming from the upper teeth or jaw.
Can sinusitis make you dizzy?
Some people do feel light-headed or “off” when heavily congested, but true spinning vertigo suggests you should think more broadly and may need assessment for other causes too.
Can allergies cause sinusitis?
Allergies can contribute to nasal inflammation and blockage, which can make sinus symptoms more likely or more persistent.
Why is my sense of smell worse?
Inflammation and blockage in the nose and sinuses can reduce smell. If this persists, especially with long-term congestion, it is worth getting checked.
Trusted UK resources
For additional information, you can read the NHS page on sinusitis, NICE guidance on acute sinusitis and antibiotics, and ENT UK information on sinus infection and chronic sinusitis.
Final word
Sinusitis is common, but that does not mean it is trivial. A short bout can make you feel dreadful for days. A long-running case can quietly wear you down for months.
The key is understanding which kind of sinus problem you are dealing with. If it is a typical short-lived episode, self-care is often enough. If symptoms are severe, prolonged, repeatedly returning, or tied to smell loss, polyps, allergy or poor nasal breathing, the answer is usually not just “another round of antibiotics”. It is a more thoughtful plan.
If your symptoms are mild, start with sensible self-care. If they are lingering, worsening or becoming a pattern, get proper advice. And if you develop eye symptoms, severe swelling or other red flags, seek urgent help.
