| Rank | Clinic Name | Patient Rating | Country | Lead Doctor | experience | Techniques | Best For | Why It’s Ranked | Accreditations |
|---|---|---|---|---|---|---|---|---|---|
| #1 | 4.5 / 5 (262) | Istanbul, Turkey | — | — | — | — | — | Joint Commission International , Turkish Medical Association (Türk Tabıplerı Bırliği) | |
| #2 | 4.6 / 5 (175) | Vienna, Austria | 27+ years | — | — | — | World's Best Hospitals 2021 by Newsweek, International Organization for Standardization | ||
| #3 | 4.8 / 5 (8) | Istanbul, Turkey | 43+ years | — | — | — | — | ||
| #4 | 4.2 / 5 | Warsaw, Poland | 47+ years | Drug therapy, allergen immunotherapy, polypectomy, functional endoscopic sinus surgery, conchoplasty | Chronic or hypertrophic rhinitis needing surgery | — | — | ||
| #5 | 4.8 / 5 (16) | Seoul, Republic of Korea | — | 1,000+ treatments | — | — | — | Korean Institute for Healthcare Accreditation | |
| #6 | 5.0 / 5 (3) | Madrid, Spain | — | — | — | — | — | Joint Commission International , International Organization for Standardization | |
| #7 | 5.0 / 5 (1) | Tekirdag, Turkey | — | — | — | — | — | American Accreditation Commission International | |
| #8 | — / 5 | Incheon, Republic of Korea | 76+ years | — | Allergic rhinitis and related sinus conditions | KOIHA-accredited hospital with an otorhinolaryngology department specializing in rhinitis. FESS available. Lead ENT doctor fellowship-trained at top US institutions. | Advanced Regenerative Medicine Implementation Institution (Ministry of Health and Welfare, Republic of Korea), Korean Institute for Healthcare Accreditation | ||
| #9 | 4.6 / 5 | Cairo, Egypt | 13+ years | — | — | — | Global Hospital Rating | ||
| #10 | 2.6 / 5 | Dusseldorf, Germany | — | — | — | — | — | International Accreditation System for Interventional Oncology Services (IASIOS), German Cancer Society |