Chronic Rhinosinusitis with Polyps

Introduction

If you have been told that you have chronic rhinosinusitis with nasal polyps, you are dealing with a condition that does more than block your nose. It can dull your sense of smell, disturb your sleep, leave your face feeling heavy, and make every cold seem worse and longer than it should be. Many people live with these symptoms for years before they learn there is a name for what they have, and that it can be treated in a structured way.

Chronic rhinosinusitis with polyps — often shortened to CRSwNP — is a long-term inflammatory condition. It is not a single infection that can be cured with one course of antibiotics. It is a chronic disease of the lining of the nose and sinuses, and it usually needs ongoing care that combines daily nasal treatments, sometimes surgery, and in more severe cases newer biologic medicines.

This guide is written for adults who already have a diagnosis, or who are being investigated for one, and want to understand what comes next. It explains how the condition develops, how doctors decide between medical treatment, surgery, and biologic therapy, what recovery and follow-up look like, and how to live well with a condition that can return even after good treatment.

What Is Chronic Rhinosinusitis with Polyps?

Your sinuses are air-filled spaces inside the bones of your face, around your nose and eyes. They are lined by a thin, moist tissue called the mucosa. In a healthy nose, this lining produces mucus that traps dust and germs, and tiny hair-like structures (cilia) sweep the mucus through small openings into the nose, where it is cleared.

In chronic rhinosinusitis, this lining becomes inflamed and stays inflamed for at least 12 weeks. The swelling narrows or blocks the natural drainage pathways, mucus builds up, and infections become more frequent. Doctors divide chronic rhinosinusitis into two main groups based on what they see inside the nose:

• Chronic rhinosinusitis without nasal polyps (CRSsNP) — inflammation without visible polyp growths.
• Chronic rhinosinusitis with nasal polyps (CRSwNP) — inflammation along with soft, grape-like swellings of the sinus lining that grow into the nasal cavity.

Nasal polyps are not tumours and are not cancerous. They are overgrowths of inflamed, water-logged tissue. They usually grow from the upper parts of the nasal cavity and from the ethmoid sinuses (a group of small sinuses between the eyes), and they tend to appear on both sides of the nose. A polyp on only one side is treated differently and always needs careful evaluation to rule out other causes.

The European Position Paper on Rhinosinusitis and Nasal Polyps (EPOS 2020), one of the most widely used international guidelines on this condition, describes CRSwNP as a type 2 inflammatory disease in most patients. This means the immune system in the sinus lining is overactive in a particular way, producing chemicals such as IL-4, IL-5, and IL-13 and recruiting cells called eosinophils. Understanding type 2 inflammation matters because it explains why CRSwNP often goes together with asthma and allergies, and why the newer biologic medicines — which switch off parts of this inflammation — work so well in some patients.

Causes and Risk Factors

There is no single cause of chronic rhinosinusitis with polyps. It develops from a combination of factors that drive ongoing inflammation in the sinus lining. Researchers continue to study why some people develop polyps while others with similar exposures do not.

Type 2 Inflammation

The most important factor in most adult CRSwNP is type 2 inflammation, an overactive immune response that produces large numbers of eosinophils in the sinus tissue. This pattern is also seen in asthma, eczema, and allergic conditions, which is why these illnesses cluster together.

Asthma and Allergies

Many adults with CRSwNP also have asthma. The two conditions share the same inflammatory pathway, and treating one often helps the other. Allergic rhinitis (hay fever) can worsen symptoms but is not always present.

Aspirin-Exacerbated Respiratory Disease (AERD)

Some people with nasal polyps also have asthma and develop breathing problems after taking aspirin or other non-steroidal anti-inflammatory drugs (NSAIDs) such as ibuprofen. This combination is called aspirin-exacerbated respiratory disease, or AERD (sometimes called Samter's triad). It is a more aggressive form of CRSwNP, with polyps that grow back quickly after surgery.

Other Contributors

• Genetics — CRSwNP often runs in families.
• Environmental irritants — tobacco smoke, occupational dusts and chemicals, and high levels of air pollution can worsen sinus inflammation.
• Microbiome changes — differences in the bacteria and fungi that live in the nose may play a role, though the picture is not fully understood.
• Anatomical factors — a deviated septum or narrow sinus openings do not cause polyps, but they can make symptoms worse and influence surgical planning.

In children, CRSwNP is uncommon and is more often linked to specific underlying conditions such as cystic fibrosis or primary ciliary dyskinesia. This is covered in its own section below.

Signs and Symptoms to Monitor

If you already have a CRSwNP diagnosis, you are likely familiar with the symptoms. The reason to review them here is not to help you recognise the condition for the first time, but to help you track changes — especially flares and recurrence after treatment. Major guidelines, including EPOS and the American Academy of Otolaryngology-Head and Neck Surgery (AAO-HNS) guideline on adult sinusitis, define chronic rhinosinusitis by the presence of two or more of the following symptoms for at least 12 weeks, with one of the first two:

• Nasal blockage or congestion — often on both sides.
• Nasal discharge — running nose, postnasal drip, or thick mucus at the back of the throat.
• Facial pain or pressure — over the cheeks, between the eyes, or in the forehead.
• Reduced or lost sense of smell (hyposmia or anosmia) — one of the most distinctive features of CRSwNP. Loss of smell often also dulls the sense of taste.

Other common features include mouth breathing, snoring, poor sleep, fatigue, and a tendency to catch frequent colds that seem to linger. Symptoms typically fluctuate. A sudden worsening — with fever, severe facial pain, swelling around the eye, vision changes, or a stiff neck — is not a typical flare and needs urgent medical attention.

How CRSwNP Is Diagnosed

Diagnosis is based on a combination of your symptom history, a direct look inside the nose, and imaging when needed.

Clinical History

Your ENT specialist will ask about the duration of symptoms, what makes them better or worse, prior treatments, and conditions such as asthma, allergies, and reactions to aspirin or NSAIDs. This history shapes both the diagnosis and the treatment plan.

Nasal Endoscopy

A thin, flexible or rigid scope with a camera and light is passed gently into the nose after a local decongestant or anaesthetic spray. It allows the doctor to see polyps, swelling, pus, or other findings that are not visible from the outside. Endoscopy is also used to grade the severity of polyps and to follow up after treatment.

CT Imaging of the Sinuses

A CT scan shows the anatomy of all the sinuses in detail, including which ones are blocked or filled with disease. It is essential before surgery and is also used when symptoms do not improve with medical treatment. MRI is used selectively, mainly when there is concern about complications or when the diagnosis is unclear.

Tests for Coexisting Conditions

Because CRSwNP often travels with other type 2 inflammatory diseases, your specialist may arrange:

• Allergy testing (skin prick or blood tests) where allergies are suspected.
• Lung function tests if there is any suggestion of asthma.
• Blood tests including eosinophil counts and total IgE, which help assess the type of inflammation and inform decisions about biologic therapy.
• A sweat chloride test or genetic testing in younger patients, to look for cystic fibrosis.

Tissue Sampling

Treatment of CRSwNP is built around three principles: reducing inflammation in the sinus lining, restoring airflow and drainage, and preventing recurrence. EPOS 2020 and the AAO-HNS guideline describe a stepwise approach. Most patients start with daily medical therapy. If symptoms remain uncontrolled, surgery or biologic therapy is added. The decision to step up is shared between you and your ENT specialist, usually with input from allergists or pulmonologists when asthma and allergies are involved.

Daily Medical Therapy: The Foundation

Almost every patient with CRSwNP, regardless of severity, uses daily medical therapy as the base of treatment. This usually includes:

• Intranasal corticosteroid sprays — the cornerstone of treatment. These reduce inflammation in the sinus lining and shrink polyps modestly over weeks. They are used continuously, not just during flares. Side effects are usually limited to mild nasal dryness or occasional nosebleeds.
• Saline nasal irrigations — large-volume rinses using a bottle or neti pot, with a buffered saline solution. EPOS strongly supports daily irrigations because they wash out mucus, allergens, and inflammatory mediators, and help nasal steroids reach more of the sinus lining. After sinus surgery, irrigations become even more effective because the sinuses are more accessible.
• Topical corticosteroid drops or steroid rinses — in more severe disease, or after surgery, doctors may prescribe higher-strength topical steroids delivered as drops or added to saline rinses. This delivers more medicine directly to the inflamed tissue.

Short Courses of Oral Steroids

Oral corticosteroids such as prednisolone can shrink polyps quickly and improve smell and breathing within days. However, they have meaningful side effects when used often or for long periods — including weight gain, mood changes, raised blood sugar, weakened bones, and increased infection risk. Current guidelines describe them as useful for short bursts (typically once or twice a year) to settle flares or to prepare for surgery, but not as a long-term solution.

Antibiotics

CRSwNP is an inflammatory condition, not primarily a bacterial infection, so antibiotics play a limited role. They are used when there is a clear acute infection on top of chronic disease. Long courses of low-dose macrolide antibiotics are sometimes considered in selected patients with CRSwNP that does not have prominent type 2 inflammation, but this is a specialist decision.

Treating Coexisting Conditions

Because asthma, allergies, and AERD share the same underlying inflammation, controlling them helps the sinuses too. This may include:

• Inhaled steroids and bronchodilators for asthma.
• Antihistamines or allergen avoidance for allergic rhinitis.
• Aspirin desensitisation in carefully selected AERD patients, supervised in a hospital setting.
• Avoiding NSAIDs in anyone with confirmed AERD.

Endoscopic Sinus Surgery (ESS)

When polyps and symptoms persist despite optimal medical therapy, your ENT specialist may discuss functional endoscopic sinus surgery, often called ESS or FESS. The aim is not just to remove polyps but to open the natural drainage pathways of the sinuses so that air can move freely and topical steroid rinses can reach the inflamed lining afterwards.

ESS is performed entirely through the nostrils. There are no external cuts and no facial scars. Working with an endoscope and fine instruments, the surgeon removes polyps, takes down the thin bony walls between sinus cells, and creates wider openings into the maxillary, ethmoid, frontal, and sphenoid sinuses as needed. Modern ESS is tailored to the extent of disease seen on CT and at endoscopy. In severe polyp disease, a more complete procedure — sometimes called a full-house or extended sinus surgery — opens all the sinuses so that ongoing medical treatment can work as well as possible.

Surgery is most often carried out under general anaesthesia. Many patients go home the same day or after one night in hospital. Nasal packing may be used for a short time after surgery, depending on bleeding and the surgeon's technique.

It is important to understand that ESS does not cure CRSwNP. It creates the conditions for medical therapy to work better and gives strong relief of blockage, pressure, and often smell loss. Polyps can return, particularly in people with severe type 2 inflammation, AERD, or asthma. For this reason, daily nasal steroid rinses and follow-up appointments continue after surgery, indefinitely in most cases.

Biologic Therapy

A major change in the treatment of CRSwNP over the past several years has been the arrival of biologic medicines — injectable antibodies that block specific parts of type 2 inflammation. They are not chemotherapy and not steroids. They target single molecules involved in driving polyp growth, such as IL-4 and IL-13 (dupilumab), IL-5 or its receptor (mepolizumab, benralizumab), or IgE (omalizumab).

EPOS 2020 and EUFOREA (European Forum for Research and Education in Allergy and Airway Diseases) describe biologics as an option for adults with severe CRSwNP that is not adequately controlled despite both surgery and ongoing medical therapy, or in patients in whom surgery is not suitable. Indicators that doctors typically look for when considering biologic therapy include:

• Significant polyp regrowth after one or more sinus surgeries.
• Need for repeated courses of oral steroids.
• Coexisting moderate or severe asthma.
• Loss of smell that has not responded to other treatment.
• Markers of strong type 2 inflammation, such as raised blood eosinophils or IgE.

Biologics are given as injections every two, four, or eight weeks depending on the medicine. Many patients can be taught to inject at home. In clinical studies, biologics have been shown to reduce polyp size, improve nasal breathing and sense of smell, lower the need for oral steroids and revision surgery, and improve coexisting asthma. They are generally well tolerated, with injection-site reactions being the most common side effect. Cost and access vary by health system, and the decision to start a biologic is taken in specialist ENT or allergy clinics, often with shared decision-making about expected benefit and the open-ended nature of treatment.

Lifestyle and Self-Management

Day-to-day habits do not cure CRSwNP, but they meaningfully affect how you feel and how often you flare. The areas that matter most include:

• Daily nasal irrigation — using a large-volume saline rinse, typically once or twice a day, is one of the most useful things you can do. Use distilled, sterile, or previously boiled and cooled water to prepare the solution.
• Consistent use of prescribed sprays — intranasal steroids work only when used regularly. Skipping doses when symptoms feel better often leads to flares. Correct spray technique — aiming away from the central nasal septum — reduces irritation and nosebleeds.
• Avoiding tobacco smoke — both your own and second-hand smoke worsen sinus inflammation.
• Managing indoor air — reducing dust mites, controlling humidity, and using air filtration can help in allergic individuals.
• Avoiding aspirin and NSAIDs if you have AERD — paracetamol and certain selective COX-2 inhibitors are usually safer alternatives, but only on the advice of your doctor.
• Treating asthma well — uncontrolled asthma drives sinus inflammation and vice versa.
• Sleep position and humidification — some patients find that elevating the head of the bed and using a humidifier reduces overnight congestion.

Monitoring and Follow-up

Because CRSwNP is a long-term condition, follow-up is part of the treatment, not an optional extra. Your ENT specialist will typically arrange:

• Periodic nasal endoscopy to look for early polyp regrowth.
• Symptom scoring tools, such as the SNOT-22 questionnaire, to track how the condition affects your quality of life over time.
• Smell testing, where available, to monitor changes in olfactory function.
• Coordination with allergy or respiratory specialists if you also have asthma or AERD.
• Imaging (CT) when symptoms change significantly or before surgery.

Complications

Most people with CRSwNP do not develop serious complications, but the condition can have several broader effects:

• Persistent loss of smell — long-standing polyp disease can damage the olfactory area at the top of the nasal cavity, sometimes leading to incomplete recovery of smell even after treatment.
• Sleep disturbance and fatigue — nasal blockage worsens snoring and contributes to poor sleep quality, and in some patients to sleep apnoea.
• Worsening of asthma — uncontrolled sinus disease can drive more frequent asthma exacerbations.
• Acute infections — episodes of acute bacterial sinusitis on top of chronic disease. In rare cases, infection can spread to the eye socket or, very rarely, to the lining of the brain. Severe facial swelling, eye pain or vision changes, very severe headache, or neck stiffness need urgent care.
• Side effects of treatment — repeated courses of oral steroids carry their own risks, which is one of the reasons newer therapies aim to reduce the need for them.

Living with Chronic Rhinosinusitis with Polyps

Living well with CRSwNP usually means accepting two things: this is a long-term condition that is managed rather than cured, and very effective treatments do exist. Most patients reach a stable state in which symptoms are controlled most of the time, with occasional flares that respond to short courses of additional treatment.

Loss of smell often has the biggest emotional impact. Food can lose its pleasure, and personal safety concerns — not being able to smell smoke, gas leaks, or spoiled food — are real. Smell training, in which you actively sniff a small set of distinct odours each day for several months, is a low-risk practice that some patients find helpful in supporting smell recovery, particularly after surgery or biologic therapy.

Work, exercise, and travel can almost always continue. Flying with active sinus disease can be uncomfortable; nasal decongestant sprays used briefly before take-off and landing can reduce ear and sinus pain, but should not be used for more than a few days because of rebound congestion. Swimming pools with high chlorine levels can irritate the sinus lining in some patients, and saline rinses after swimming help.

The emotional weight of long-standing nasal blockage, poor sleep, and fluctuating symptoms should not be underestimated. If you find your mood, energy, or motivation slipping, it is worth raising this during follow-up appointments. Addressing sleep and mental health is part of comprehensive care.

Chronic Rhinosinusitis with Polyps in Children

Nasal polyps are uncommon in children, and when they do appear they almost always raise the suspicion of an underlying condition rather than typical adult CRSwNP. The two most important conditions to consider are cystic fibrosis and primary ciliary dyskinesia. Both affect mucus clearance throughout the body and can produce polyps in childhood.

For this reason, a child found to have nasal polyps will usually be referred for:

• A sweat chloride test and genetic testing to look for cystic fibrosis.
• Assessment of ciliary function if primary ciliary dyskinesia is suspected.
• Evaluation by a paediatric ENT specialist, often together with a paediatric pulmonologist.

Treatment in children follows the same general principles — nasal steroid sprays, saline irrigation, and sinus surgery when needed — but is closely coordinated with treatment of the underlying disease. The threshold for surgery, the surgical techniques used, and the long-term follow-up plan differ from those used in adults, and these decisions belong with a paediatric ENT team.

Preventing Recurrence and Progression

CRSwNP has a natural tendency to come back, especially in people with strong type 2 inflammation, asthma, or AERD. While complete prevention of recurrence is not always possible, the chance of it — and the severity when it happens — can be reduced. Strategies that current guidelines emphasise include:

• Continuing nasal steroid sprays or rinses after surgery, often indefinitely.
• Attending follow-up endoscopies even when you feel well, so early changes can be caught.
• Treating asthma and allergies actively rather than waiting for them to worsen.
• Avoiding triggers such as cigarette smoke and known occupational irritants.
• For severe, recurrent disease, considering biologic therapy earlier rather than after repeated surgeries.

When to Seek Urgent Care

Most CRSwNP symptoms can wait for a routine clinic appointment. However, some signs may indicate a serious complication and need urgent medical assessment:

• Sudden severe headache with fever.
• Swelling, redness, or pain around the eye.
• Double vision or any change in vision.
• A stiff neck, confusion, or unusual drowsiness.
• Heavy nosebleeds that do not stop with simple pressure.
• Severe pain not relieved by usual measures.

These features are uncommon but important to recognise, particularly during a flare or in the days after sinus surgery.

Frequently Asked Questions

Are nasal polyps cancerous?

No. Nasal polyps in CRSwNP are non-cancerous overgrowths of inflamed tissue. However, a polyp on only one side, or one that looks unusual on imaging, is investigated more carefully because rare growths in the nose can mimic polyps.

Will surgery cure my condition?

Surgery is not a cure. It removes existing polyps, opens the sinuses, and creates conditions for medical therapy to work better. Most people experience major improvement after surgery, but polyps can return, particularly in severe type 2 inflammation or AERD. Daily nasal treatment and follow-up continue after surgery.

Why is my sense of smell affected?

The smell receptors sit high up in the nasal cavity. Polyps and swelling block air — and odours — from reaching them. Long-standing inflammation can also damage the smell nerves directly. Treatment often improves smell, but recovery may be partial, especially after many years of disease.

How are biologic medicines different from steroids?

Steroids are broad anti-inflammatory medicines that act on many parts of the immune system. Biologics are antibodies designed to block one specific molecule involved in type 2 inflammation. This targeted action means they can be effective with fewer of the wide-ranging side effects of long-term steroids, although they have their own considerations and are reserved for severe disease.

Can diet or supplements help?

There is no specific diet that has been shown to reverse CRSwNP. In AERD, avoiding aspirin and certain NSAIDs is essential. Otherwise, a balanced diet, good hydration, and treating any confirmed food allergies are reasonable general measures, but supplements do not replace medical treatment.

How long until I notice improvement after starting treatment?

Nasal steroid sprays usually start to help within two to four weeks, with larger benefit over several months. Oral steroids work within days but are used only for short courses. After endoscopic sinus surgery, breathing often improves within one to two weeks; full healing of the sinus lining takes around three months. Biologic therapy typically shows benefit within the first few months, with improvement in smell sometimes appearing surprisingly early.

Do polyps always come back?

Polyps return in a significant share of patients after surgery, especially in those with severe type 2 inflammation, AERD, or asthma. Continued daily nasal treatment, follow-up, and where appropriate biologic therapy reduce both the chance and the severity of recurrence.

Can I exercise normally?

Yes, exercise is encouraged and is good for general airway health. Avoid strenuous exertion in the first two weeks after sinus surgery and follow your surgeon's specific instructions. Swimming and diving usually resume after the sinus lining has healed.

Conclusion

Chronic rhinosinusitis with polyps is a long-term inflammatory condition of the nose and sinuses, not a series of unconnected infections. It has clear treatment pathways, anchored in international guidelines, and a growing set of options that range from daily nasal sprays and rinses to endoscopic sinus surgery and biologic medicines for severe disease.

Most people with CRSwNP can expect meaningful improvement in nasal breathing, sinus pressure, sleep, and often sense of smell, with continued care to keep the condition controlled. Because the disease can return, the most useful framing is not a single course of treatment but an ongoing partnership with an ENT specialist — one that adjusts therapy to how the disease behaves over time and brings in allergy or respiratory care when needed. Understanding your own pattern of symptoms, sticking with daily treatment, and attending follow-up are the foundations of living well with this condition.