departments
Internal Medicine
内科 (naika)
Internal medicine (内科, naika) is the broadest medical specialty, dealing with the diagnosis and non-surgical treatment of diseases affecting internal organs in adults. It covers cardiovascular, respiratory, gastrointestinal, endocrine, kidney, and infectious diseases. In Japan, 内科 is typically the first department to visit for common illnesses such as fever, cough, fatigue, or diabetes management.
Naika clinics are the most common type of clinic in Japan and serve as the primary care point of contact for most adult health concerns.
In 9 languages
| Language | Term |
|---|---|
| English | Internal Medicine |
| Japanese (日本語) | 内科 |
| Chinese (中文) | 内科 |
| Korean (한국어) | 내과 |
| Portuguese | Medicina interna |
| Spanish | Medicina interna |
| Filipino | Panloob na Medisina |
| Thai | อายุรศาสตร์ |
| Vietnamese | Nội khoa |
| Romanization | naika |
Learn more in the guide:
Read the guide →Last reviewed: September 2026