Maxillary Sinusitis - Symptoms, Causes, Treatment & Prevention

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Overview

Maxillary sinusitis, also called maxillary sinus infection or maxillary rhinosinusitis, is an inflammation of the lining (Mucosa) of the maxillary sinuses – the largest pair of paranasal sinuses located in the cheekbones on either side of the nose. When the sinus lining becomes swollen, it can block normal drainage, leading to fluid buildup, pain, and infection.

Who it affects: Maxillary sinusitis can occur at any age, but it is most common in adults between 20‑60 years. It affects both sexes equally, although women may report sinus symptoms slightly more often, possibly because of hormonal influences on nasal mucosa.<sup>[1]</sup>

Prevalence: In the United States, an estimated 30‑40 million adults experience acute sinusitis each year, and roughly 10 % of those have involvement of the maxillary sinuses.<sup>[2]</sup> Chronic maxillary sinusitis accounts for about 5‑15 % of all chronic rhinosinusitis cases worldwide.<sup>[3]</sup>

Symptoms

Symptoms may be acute (lasting < 4 weeks), sub‑acute (4‑12 weeks), or chronic (≥12 weeks). Common features include:

• Facial pain or pressure – usually localized over the cheekbones, may worsen when bending forward or lying down.
• Nasopharyngeal discharge – thick, yellow‑green or clear mucus that may drip down the back of the throat (post‑nasal drip).
• Nasal congestion – feeling of stuffiness, often unilateral (one side).
• Reduced sense of smell (hyposmia) or taste.
• Dental pain – especially in the upper premolar/molar teeth, often misdiagnosed as a toothache.
• Headache – pressure‑type pain that may radiate to the forehead or jaw.
• Fever – more common in acute bacterial infection.
• Cough – from post‑nasal drip, frequently worse at night.
• Ear fullness or pressure – due to eustachian tube involvement.
• Bad breath (halitosis).
• Fatigue – chronic inflammation can affect overall energy levels.

In chronic cases, symptoms may be milder but persistent, and nasal polyps or mucosal thickening may develop.

Causes and Risk Factors

Primary Causes

• Infection – bacterial (most commonly Streptococcus pneumoniae, Haemophilus influenzae, Moraxella catarrhalis) or viral (influenza, rhinovirus). Fungal infections are rare but occur in immunocompromised patients.
• Allergic rhinitis – inflammation from allergens can obstruct sinus outflow.
• Dental pathology – an infected upper tooth or periodontal disease can spread directly into the maxillary sinus (odontogenic sinusitis).
• Structural abnormalities – deviated septum, concha bullosa, or narrow osteomeatal complex.
• Trauma – facial injuries can fracture the sinus walls, disrupting drainage.

Risk Factors

• Recent upper‑respiratory infection (common cold).
• Allergies (seasonal or perennial).
• Smoking & exposure to second‑hand smoke.
• Asthma or chronic obstructive pulmonary disease (COPD).
• Immune suppression – HIV, chemotherapy, systemic steroids.
• Dental procedures involving the upper premolar/molar region.
• Environmental irritants – air pollution, occupational dust.
• Cold, dry climate – can dry nasal mucosa, making it susceptible.

Diagnosis

Accurate diagnosis combines a thorough history, physical exam, and targeted investigations.

Clinical Evaluation

• History – duration of symptoms, recent infections, dental work, allergy history.
• Physical exam – anterior rhinoscopy or nasal endoscopy to view nasal cavity, and gentle percussion of the maxillary sinus (tapping the cheek) to elicit tenderness.
• Olfactory testing – simple smell identification tests can document hyposmia.

Imaging

• Computed Tomography (CT) scan – the gold standard for sinus imaging; shows mucosal thickening, air‑fluid levels, or bony erosion. Low‑dose protocols are now available for chronic disease.
• Plain sinus X‑ray – limited utility, may miss early disease.
• Magnetic Resonance Imaging (MRI) – reserved for suspected complications (e.g., cavernous sinus thrombosis, fungal infection) because it better visualizes soft tissue.

Laboratory Tests

• Complete blood count (CBC) – may show elevated white cells in bacterial infection.
• Sinus aspirate / culture – performed when disease is refractory or in immunocompromised patients; guides antibiotic choice.
• Allergy testing – skin prick or specific IgE when allergies are suspected as a contributing factor.

Treatment Options

The therapeutic approach depends on whether the sinusitis is acute, sub‑acute, or chronic, and whether an infection is bacterial, viral, allergic, or odontogenic.

Acute Bacterial Maxillary Sinusitis (≤4 weeks)

• Antibiotics – first‑line agents include amoxicillin‑clavulanate (875 mg/125 mg BID) for 5–7 days; doxycycline or a respiratory fluoroquinolone (levofloxacin) for penicillin‑allergic patients.<sup>[4]</sup>
• Adjunctive therapy – intranasal corticosteroid spray (e.g., fluticasone) to reduce mucosal edema; saline nasal irrigation 2–3 times daily.
• Pain control – acetaminophen or ibuprofen as needed.

Viral or Allergic Sinusitis

• Antibiotics are NOT indicated.
• Intranasal antihistamine or corticosteroid sprays for allergic component.
• Oral decongestants (pseudoephedrine) for short‑term relief—avoid >3 days to prevent rebound congestion.

Chronic Maxillary Sinusitis (≥12 weeks)

1. Medical management
   • Prolonged intranasal corticosteroids (fluticasone, budesonide).
   • Saline irrigations – hypertonic solutions can reduce edema.
   • Leukotriene antagonists (montelukast) if asthma or allergies coexist.
   • Long‑term low‑dose macrolide therapy (e.g., azithromycin 250 mg three times weekly) for its anti‑inflammatory properties, after specialist evaluation.
2. Surgical intervention (when medical therapy fails)
   • Functional endoscopic sinus surgery (FESS) – creates a larger opening for drainage; 85‑90 % success in improving symptoms.<sup>[5]</sup>
   • Balloon sinuplasty – minimally invasive dilation of the sinus ostium; suitable for selected patients with isolated maxillary disease.
   • Odontogenic cases may require combined dental extraction or root canal therapy plus sinus surgery.

Lifestyle & Home Remedies

• Increase humidity (use a humidifier).
• Avoid irritants – cigarette smoke, strong odors.
• Hydrate well – thin mucus secretions.
• Warm compresses over the cheeks can alleviate pressure.

Living with Maxillary Sinusitis

Even after treatment, many patients need ongoing strategies to keep symptoms at bay.

• Routine saline irrigation – 1‑2 cups per day using a neti pot or squeeze bottle. Use distilled, boiled, or pre‑treated water to avoid infection.
• Allergy management – keep windows closed during high pollen seasons, wash bedding weekly in hot water, and consider a HEPA air purifier.
• Dental hygiene – brush twice daily, floss, and see a dentist regularly; address any upper‑tooth pain promptly.
• Medication adherence – complete the full antibiotic course, use nasal sprays correctly (tilt head, spray and breathe in).
• Follow‑up appointments – schedule ENT reviews 4‑6 weeks after acute treatment, and every 6‑12 months for chronic cases.

Prevention

Many triggers are modifiable:

1. Vaccination – annual influenza vaccine and COVID‑19 boosters reduce viral URIs that can precipitate sinusitis.
2. Hand hygiene – frequent washing limits spread of respiratory pathogens.
3. Control allergies – use prescribed antihistamines and nasal steroids; consider allergen immunotherapy for persistent triggers.
4. Smoke‑free environment – quit smoking; avoid exposure to second‑hand smoke.
5. Protective gear – wear masks in dusty or polluted settings; use goggles when swimming in poorly chlorinated pools.
6. Prompt treatment of upper‑respiratory infections – early use of decongestants and nasal saline can prevent blockage.

Complications

If left untreated or inadequately treated, maxillary sinusitis can lead to serious sequelae:

• Orbital cellulitis – infection spreads to the eye socket, causing pain, swelling, and vision changes.
• Osteomyelitis of the maxilla – bacterial invasion of the bone, rare but possible after chronic infection.
• Chronic dental pain or tooth loss – due to persistent odontogenic infection.
• Meningitis or cavernous sinus thrombosis – rare, life‑threatening spread to the central nervous system.
• Mucocele formation – cystic expansion that may erode adjacent bone.
• Reduced quality of life – chronic facial pain, sleep disturbance, and impaired productivity.<sup>[6]</sup>

When to Seek Emergency Care

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References:

1. Mayo Clinic. Sinusitis. Accessed March 2024.
2. Centers for Disease Control and Prevention. Sinus Infections (Sinusitis) Fact Sheet. 2023.
3. World Health Organization. Global Prevalence of Chronic Rhinosinusitis. 2022.
4. American Academy of Otolaryngology–Head and Neck Surgery. Clinical Practice Guideline: Adult Sinusitis. 2023.
5. Cleveland Clinic. Functional Endoscopic Sinus Surgery (FESS). 2024.
6. National Institutes of Health. Impact of Chronic Sinusitis on Quality of Life. 2023.

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