Nasal cavity polyp

What is a nasal cavity polyp?

A nasal polyp is a soft, painless, non-cancerous growth arising from the mucous membrane lining the nasal passages or paranasal sinuses. They develop from chronic inflammation of the nasal mucosa and hang from the nasal walls or sinuses like small teardrops or grapes. They can occur singly or in clusters and range from tiny to large enough to completely obstruct the nasal airway.

Nasal polyps are classified by their origin and association:

• Ethmoidal polyps: the most common type. They grow on both sides of the nose, start in the upper sinuses, and are usually triggered by chronic allergies or long-term sinus infections.

• Antrochoanal polyps: these grow as a single mass on just one side of the nose, starting in the cheek sinus and stretching toward the back of the throat. They are more common in children and young adults.

• AERD-associated polyps: severe, fast-returning polyps that develop in people who have a specific combination of asthma, nasal polyps, and aspirin sensitivity.

• Cystic fibrosis polyps: a distinct type of polyp that forms differently due to the genetic traits of cystic fibrosis.

Important note: Not all growths in the nose are harmless polyps. A growth that appears on only one side, especially if it bleeds or causes pain, requires a specialist's evaluation to rule out a more serious tumor.

Nasal polyps cause symptoms through physical obstruction of the nasal airway and disruption of normal mucociliary clearance. Common signs include:

• Persistent nasal obstruction or blockage, typically bilateral in ethmoidal polyps

• Reduced or absent sense of smell (hyposmia or anosmia), one of the most distressing and persistent symptoms

• Reduced taste sensation secondary to loss of smell

• Persistent nasal discharge, typically clear and mucoid

• Post-nasal drip causing chronic throat clearing or cough

• A feeling of pressure or fullness around the cheeks, forehead, or between the eyes

• Recurrent or chronic sinusitis from impaired sinus drainage

• Snoring and disrupted sleep from nasal obstruction

• In large polyps: a visible mass in the nasal passage or mouth breathing

Nasal polyps develop from chronic inflammation of the nasal and sinus mucosa. Contributing causes include:

• Chronic rhinosinusitis: the most common underlying condition, with persistent sinonasal inflammation driving mucosal oedema and polyp formation over months to years.

• Allergic rhinitis: ongoing allergic inflammation from inhaled allergens promotes the eosinophilic inflammation that underlies most nasal polyps.

• Asthma: strongly associated with nasal polyps, sharing the same type 2 inflammatory pathway involving eosinophils and IL-5 signalling.

• Aspirin-exacerbated respiratory disease: the combination of polyps, asthma, and aspirin sensitivity reflects dysregulated arachidonic acid metabolism causing disproportionate leukotriene production in the nasal and bronchial mucosa.

• Cystic fibrosis: it causes polyps through abnormal mucociliary clearance and chronic infection rather than eosinophilic inflammation.

• Immune deficiency: recurrent sinonasal infections from impaired immune function can drive chronic mucosal inflammation and polyp formation.

• Genetic predisposition: family history of nasal polyps and associated conditions increases individual risk.

Nasal polyps are detected through imaging of the nasal cavity and sinuses, with blood tests identifying the underlying inflammatory and allergic conditions driving their formation.

Head and Neck MRI Elfcare’s full-body MRI checks the nasal passages and sinuses, identifying polyps, swelling, and fluid blockages. Compared to traditional imaging, MRI provides more detail for distinguishing harmless polyps from a more serious growth. Finding them on a scan gives a clear structural explanation for breathing issues or congestion that might otherwise have been blamed on endless colds or allergies.

Blood tests identify the inflammatory, allergic, and immune conditions most commonly driving nasal polyp formation. Relevant markers in Elfcare's panel include:

• Eosinophil count: elevated eosinophils are the hallmark of the type 2 inflammatory pathway underlying most nasal polyps and predict both severity and treatment response

• Total IgE: elevated total IgE reflects overall allergic immune activity, relevant to allergic rhinitis as a driver of polyp formation

• CRP: reflects systemic inflammation relevant to the chronic rhinosinusitis driving polyp development

• Full blood count: provides broader immune context including white cell differential relevant to underlying immune conditions

• Glucose and HbA1c: diabetes impairs immune function and mucosal healing, predisposing to recurrent sinonasal infections that drive polyp formation

• Vitamin D: deficiency is associated with impaired innate immune function and increased susceptibility to recurrent respiratory infections

Why early detection matters

Nasal polyps are a chronic, relapsing condition. Without treatment, they progressively enlarge, causing worsening nasal obstruction, complete loss of smell, and chronic sinusitis with recurrent infections. Prolonged anosmia is associated with reduced quality of life, nutritional consequences from loss of taste, and safety risks from inability to detect smoke or gas. Chronic untreated sinonasal inflammation causes irreversible damage to the nasal and sinus mucosa that makes future treatment less effective. Identifying polyps early, when they are small and the underlying inflammation is still modifiable, allows for medical treatment including intranasal corticosteroids and biologic therapies that can significantly reduce polyp burden and restore nasal function without surgery.

How Elfcare can help

Elfcare's full body MRI covers the head and neck soft tissues as standard, directly imaging the nasal cavity and paranasal sinuses and identifying polyps, mucosal disease, and any structural findings requiring further assessment. For a condition that frequently causes symptoms for years before being structurally investigated, this imaging provides both the diagnosis and the context for appropriate management.

Our blood panel covers eosinophil count, total IgE, CRP, and metabolic markers, identifying the inflammatory and allergic drivers of polyp formation.

If our MRI or blood tests identify nasal polyps or related sinonasal findings, we take care of further diagnostics or refer you to the appropriate specialist.