Rhinosinusitis: What It Is, Symptoms, and When to See an ENT Specialist
September 30, 2026
If you heard the word rhinosinusitis during a consultation or read it in an imaging report, let's start with what matters most: it is not a new diagnosis, and it is not more serious than what you already suspected. It is the correct name for something you know as sinusitis. And one number sums up almost everything: four. Four symptoms support this diagnosis, and two of them are enough, with one condition about which two, to name it precisely.
The name change is not an academic whim. It better describes what happens inside your nose and explains why the treatments you've been given work for a while and then stop working. A problem that is only half named is also only half treated.
Here we explain what it is, how it differs from rhinitis, what causes it, how it is properly diagnosed, and when it makes sense to stop managing symptoms and look for the cause.
Hi, I'm Dr. Carlos Yáñez, founder of Sinus Center, a center specialized in nose surgery and rhinoplasty that helps children and adults get back breathing that works every day. In our practice we constantly see patients who arrive with a diagnosis written on a piece of paper that nobody explained to them, and others who have spent years treating separate episodes without anyone connecting them.
What is rhinosinusitis?
It is inflammation of the lining of the nose and the paranasal sinuses, air-filled cavities in the forehead, the cheekbones, and between the eyes. The lining swells, produces more mucus, and narrows the passages it should drain through. You already know the result: a blocked nose, facial pressure, a runny nose, a dulled sense of smell, and a heavy head.
This is where the difference in how we work begins. This condition can be treated as inflammation and nothing more, prescription after prescription, or it can be studied as a drainage system that failed for an identifiable reason. We do the second, because an accurate diagnosis is what changes the outcome. Someone who has lived like this for five years doesn't need another medication; they need to know why their nose keeps repeating the same thing.
Rhinosinusitis and sinusitis: why it's the same diagnosis with a different name
For decades people talked about sinusitis, as if the inflammation lived only inside the sinuses. In practice it is almost impossible to find an inflamed sinus with a healthy nose, which is why the correct term today is rhinosinusitis: rhino for the nose, sinusitis for the sinuses.
The clinical consequence matters: if the problem includes the nose, a deviated septum or enlarged turbinates are not separate details, they are part of the mechanism that keeps the inflammation going. Treating only the sinuses is the most common reason a case comes back months later.
Rhinitis and rhinosinusitis: the difference that changes the treatment
Rhinitis stays in the nasal lining, without the sinuses being involved: bursts of sneezing, itching, a clear runny nose, and congestion that switches sides depending on your position. It responds well to treatment aimed at allergies.
Rhinosinusitis adds what rhinitis doesn't produce: true facial pain or pressure, thick or colored discharge, and loss of smell. Confusing the two is the mistake we see most often in the medical records that reach our office, and it explains why someone with a severely deviated septum spends years taking antihistamines. Not everything is an allergy: sometimes the problem is structural, and no medication can correct the shape of a blocked passage.
Nose and sinuses: one system, one inflammation
The lining of the nose and the lining of the sinuses are continuous, the same seamless fabric. The sinuses drain into the nose through openings of barely a couple of millimeters, and millions of cilia push mucus toward those exits. When they become inflamed, the openings close and the cilia lose their rhythm: mucus builds up and feeds the same inflammation that closed the exit.
That cycle explains why the condition becomes chronic, and why our surgical goal is never to empty the sinuses but to restore their drainage. We use image-guided endoscopic surgery because this area is measured in millimeters and sits next to the eye socket and the base of the skull, and it was that need for precision that led us to bring the technology to Mexico decades ago.
What causes rhinosinusitis?
The most common trigger is a viral infection that inflames the lining and closes the passages for a few days. In most people it clears on its own; in others the trapped mucus becomes infected and the condition drags on. The interesting question is why, with the same colds, one person gets rhinosinusitis twice a year and another never does.
What was already there before the cold
The answer almost always lies in pre-existing anatomy:
- A deviated septum that narrows one side of the nose
- Turbinate hypertrophy
- Polyps that block mucus from draining
- Anatomical variations that make the sinuses drain through a narrower channel
- After-effects of an old nasal fracture, often a sports injury from adolescence that nobody examined
On top of that, allergies and the environment complete the picture. In Mexico City, pollution, dust, altitude, and dry air all play a role, and for many of our patients so do frequent flights, because every change in cabin pressure forces the sinuses to equalize through those narrow openings.
And putting it off doesn't keep things the same: the lining thickens, polyps appear where there were none before, and a simple case becomes a complex one.
Types of rhinosinusitis: acute, bacterial, and chronic
Classifying the condition is not a formality. It determines whether you need patience, an antibiotic, or a thorough evaluation.
| Type | Duration | Distinguishing signs | Treatment approach |
|---|---|---|---|
| Acute viral rhinosinusitis | Less than 10 days | Appears after a cold and improves on its own | Symptom management and nasal rinses, no antibiotic |
| Acute bacterial rhinosinusitis | Worsens after day 5 or lasts more than 10 days | Purulent discharge, marked facial pain, and fever | Targeted antibiotic and re-evaluation |
| Chronic rhinosinusitis | More than 12 weeks | Persistent congestion and loss of smell | Investigation of the cause, extended treatment, and surgery if there is an obstruction |
| Chronic rhinosinusitis with nasal polyps | More than 12 weeks | Marked obstruction, significant loss of smell, and a high recurrence rate | Extensive endoscopic surgery and ongoing medical management |
Look for your story in the duration column, because that's where your decision is. In the first two rows, you need proper management of the episode and to keep track of how many times it happens each year. In the last two, the question is no longer what to take this time: more than twelve weeks is no longer an infection, it's an established problem that someone needs to investigate with endoscopy and imaging. When something keeps repeating, it stops being a coincidence.
What are the symptoms of rhinosinusitis?
The symptoms can be counted, and that turns a vague complaint like "I'm always congested" into a diagnosis with clear criteria. We also pay attention to what almost nobody reports as a nasal symptom: constant fatigue, poor-quality sleep, snoring, a background headache. In children it shows up as mouth breathing, restless sleep, repeated infections, irritability, and poor school performance, a picture that has more than once been mistaken for an attention problem.
The four symptoms that support the diagnosis
- Nasal obstruction or congestion, the feeling that air doesn't flow freely through one or both sides of the nose
- Discharge, either from the front when it comes out of the nose, or postnasal drip when it runs down the throat and causes throat clearing and coughing when you lie down
- Facial pain or pressure, in the forehead, between the eyes, or over the cheekbones, a head that feels heavier when you bend forward
- Loss of smell, the least reported symptom and the one that says the most about the state of the nasal lining
The rule is worth knowing: you need at least two of these four, and one of them must be obstruction or discharge. Someone with facial pain and a reduced sense of smell but a clear nose probably has something else, and looking for rhinosinusitis there leads to repeated tests and treatments that miss the mark.
Chronic rhinosinusitis: when symptoms stop being episodes
The chronic form is recognized less by its intensity than by its continuity. There is no clear beginning or end, just a baseline state: a nose that is almost always blocked, a sense of smell that has been dull for months, postnasal drip as part of the day, and fatigue that no longer seems like a symptom.
It's the profile we see most and the one that takes longest to come in: adults who sleep eight hours and wake up as if they had slept four, who snore, who no longer perform at the gym. Many have normalized it for so long that they don't mention it until they're asked directly. Your body adapts to breathing poorly and stops warning you, but adapting is not the same as being well.
How is rhinosinusitis diagnosed?
It starts with a focused medical history, which is much more than asking what hurts: how many episodes you had in the last year, what treatments you received and how you actually responded, whether the congestion is on one side or both, how your sense of smell is, how you sleep, whether you've had any injury to your nose, and whether you fly. Then comes what no description can replace: looking inside. Nasal endoscopy is done in the office in a few minutes and shows the lining, the septum, the turbinates, any polyps, and the drainage areas on video.
When the condition is chronic or recurrent, or a structural cause is suspected, we add a CT scan of the sinuses, which shows what endoscopy can't reach: which sinuses are affected and what the anatomy of each drainage channel looks like. A plain X-ray is no longer enough, because it leaves out important sinuses and produces false negatives and false positives: deciding for or against surgery based on one is a gamble. That same CT scan is the one we later load into the surgical navigation system, so the study we use to diagnose you is the map we use to operate.
How do you get rid of rhinosinusitis?
The answer depends on which type you have, which is why everything above matters. An acute episode is resolved with time and symptom management. A chronic condition is resolved when whatever is blocking drainage is corrected.
What we do is make that decision based on information, not intuition. We don't recommend surgery to someone who can be helped by a well-targeted sinusitis treatment, and we don't keep insisting on medication for years for someone with an anatomical obstruction that no drug is going to correct.
Medical treatment: what is tried first
The foundation is saline rinses, with the right technique and done consistently, because they clear thick mucus and allow topical medications to reach the lining. On top of that comes a topical nasal corticosteroid, which is what actually reduces inflammation and requires weeks of continuous use. If an allergic component is confirmed, it is treated at the same time. An antibiotic is used only when there are bacterial criteria: a condition that worsens after the fifth day or lasts more than ten, with purulent discharge, marked facial pain, and fever.
There's a pattern we read as hard evidence: the cycle of improvement and relapse. The patient follows the treatment, improves for two weeks, and relapses; changes doctors, follows another treatment plan, improves, relapses. It's not that the treatments were wrongly prescribed, it's that they were applied to a cause that nobody addressed.
Endoscopic surgery: when it stops being optional
Image-guided endoscopic sinus surgery does not mean removing the sinuses. It means opening up drainage and correcting the structure: widening the natural openings of each sinus, removing polyps or inflamed tissue, correcting the septum, and reducing the turbinates when they cause obstruction. All of it is done through the nose, with no external incisions and without changing the shape of your nose, using image navigation that shows in real time where the instrument is.
It stops being optional when the evidence adds up: more than twelve weeks without improvement despite properly followed treatment, four or more episodes a year, obstructing polyps, a clear structural cause on the CT scan, or a sense of smell that doesn't recover. And there's one factor that is rarely mentioned, time: every year it is postponed, the lining remodels itself, and the surgery that would be limited today becomes more extensive tomorrow. Operating in time means operating less.
What to ask when you receive a quote
If your case reaches the operating room, the next question is usually about cost, and it's worth arriving informed. The cost depends on how many sinuses are treated, whether the septum or turbinates are corrected in the same procedure, and the actual time in the operating room, so a number given over the phone is not a quote.
Is rhinosinusitis dangerous?
In the vast majority of cases it does not put your life at risk, and it's worth saying clearly so nobody leaves here scared. Complications do exist, and it's worth knowing them without dramatizing them. The most common involve the eye socket, because the ethmoid sinus is separated from it by a layer of bone less than a millimeter thick: inflammation can spread to the tissues around the eye and cause eyelid swelling, pain when moving the eye, or double vision. Complications inside the skull are much rarer.
The signs that require immediate attention are recognizable:
- Swelling around the eye
- Changes in vision
- A severe headache that is different from usual
- High fever or a stiff neck
That said, the real cost we see every day is not a serious complication. It's another one, quieter and more common: the years. Years of waking up without feeling rested, of performing at half capacity, of training with less air, of missing half the flavors. In children the cost is paid in their development, because a child who doesn't breathe well sleeps poorly, and a child who sleeps poorly grows, learns, and behaves differently.
Think about what your day would be like if rhinosinusitis stopped setting the pace
Imagine waking up tomorrow and noticing, without thinking about it, that you're breathing through your nose. That there was no dry mouth and no turning your pillow looking for the side that clears your nose. That your workout holds up because the air comes in when you need it. That you reach four in the afternoon with a clear head. Compare that with what you live with today, the spray in your desk drawer and the half-finished box of antibiotics. That gap isn't luck; it's a diagnosis that nobody has completed.
That's what we do at Sinus Center. We don't repeat the treatment you've already tried: we study your nose until we understand what keeps the inflammation going, and from there we build a plan that may be a well-targeted sinusitis treatment or minimally invasive, image-guided surgery designed to resolve the cause.
We see patients at Hospital ABC Santa Fe, where you can book with our ENT specialist in Santa Fe, Mexico City. If the western State of Mexico is more convenient for you, see our ENT specialist for Naucalpan, and if you live in the Toluca Valley we also see patients from Metepec.
