Sinusitis in Japan: Treatment & Finding an ENT Doctor

Overview: Sinusitis in Japan for Travelers

Sinusitis (副鼻腔炎, *fuku biku-kō en*) is an inflammation or infection of the paranasal sinuses — the air-filled cavities around the nose and eyes. It is an extremely common condition in Japan, partly driven by the country's severe cedar and cypress pollen seasons and the high prevalence of allergic rhinitis (花粉症, *kafunsho*) in the general population.

For international travelers, sinusitis risk is elevated by several Japan-specific factors:

• Cedar pollen (February–April): Japan's most common allergen, responsible for tens of millions of sufferers annually. Allergic rhinitis from pollen is the leading precursor to acute sinusitis.
• Air conditioning and heating: Rapid temperature changes and dry indoor air impair the sinuses' natural drainage and mucociliary clearance.
• Crowded enclosed environments: Increases exposure to the viral upper respiratory infections that most commonly trigger acute bacterial sinusitis.
• Altitude changes: Travel to mountainous areas can cause pressure changes affecting sinus drainage.
• Swimming in public pools: Chlorinated water entry into nasal passages can irritate sinus linings.

Japan has excellent ENT (耳鼻咽喉科, *jibi inkōka*) care infrastructure, with specialist clinics readily available even in smaller cities. Many ENT clinics offer nasal irrigation (洗浄, *senjō*) as part of standard treatment — a Japan-specific clinical practice not commonly offered in Western primary care settings.

Symptoms and Diagnosis

Acute vs Chronic Sinusitis:

Typical symptoms:

• Facial pressure or pain (over cheeks, forehead, around eyes, or at the nose bridge)
• Nasal congestion or blockage
• Thick, discolored nasal discharge (yellow or green in bacterial sinusitis)
• Post-nasal drip causing sore throat or cough
• Reduced or absent sense of smell
• Headache, often worsening when bending forward
• Fatigue
• Toothache (particularly upper back teeth) in maxillary sinusitis

Diagnosis at a Japanese ENT Clinic:

An ENT specialist uses multiple diagnostic tools:

• Nasal endoscopy (鼻腔内視鏡, *bikyū naishikyō*): direct examination of nasal passages and sinus openings — widely available in Japanese ENT clinics
• X-ray or CT scan of sinuses if chronic or complicated sinusitis is suspected
• Nasal discharge culture if bacterial infection is unclear
• Allergy testing if allergic sinusitis is suspected

Treatment in Japan

Acute viral sinusitis (most common type):

• Symptom relief: decongestants (鼻づまり薬), nasal saline rinse
• Steam inhalation
• Adequate hydration
• Most viral sinusitis resolves within 10 days without antibiotics

Acute bacterial sinusitis:

• Antibiotics: amoxicillin/clavulanate (オーグメンチン, *Ōgumenchin*) is commonly prescribed; also cefdinir, levofloxacin
• Typical course: 5–10 days
• Nasal steroid sprays to reduce mucosal inflammation
• Decongestant nasal sprays (short-term use only — maximum 3–5 days to avoid rebound congestion)

Nasal Irrigation at Japanese ENT Clinics:

A distinctive feature of Japanese ENT practice is in-clinic nasal irrigation (鼻洗浄 or 鼻腔洗浄). The doctor or nurse uses a saline solution device to flush the nasal passages and sinuses directly. This procedure:

• Removes accumulated mucus and debris
• Reduces bacterial load
• Provides significant symptom relief
• Is generally well-tolerated (though temporarily uncomfortable)

Patients are often advised to continue nasal irrigation at home using a Neti pot or squeeze-bottle irrigator (市販の鼻洗浄器 available at Japanese pharmacies). Popular products include ハナノア (Hana no A) and 生理食塩水鼻スプレー (saline nasal sprays).

For allergic sinusitis:

• Intranasal corticosteroid sprays (フルナーゼ, Flonase equivalent) — prescription in Japan
• Antihistamines (oral or nasal)
• Allergen avoidance measures
• Immunotherapy options for long-term management

Which Department to Visit and How to Find a Clinic

• 耳鼻咽喉科 (Jibi Inkōka) — ENT: the primary and ideal specialty for sinusitis
• 内科 (Naika) — Internal Medicine: acceptable for initial antibiotic prescription if ENT is unavailable
• アレルギー科 (Arerugi-ka) — Allergy Clinic: for allergy-driven sinusitis management

ENT clinics are very common throughout Japan and typically accept walk-in patients or same-day appointments. Look for the sign 耳鼻咽喉科 or 耳鼻科 (*jibi-ka*).

Use Traveler's Hospital to find ENT clinics near your location in Japan.