治る vs 治療する — both involve getting better or treating illness, but one is something that happens to you and the other is something done to you. Let's learn the difference!


This is an important distinction for talking about health in Japanese. Mixing these up can change the meaning significantly — so let's get it right!
At a Glance
| Word | Reading | Meaning | Subject |
|---|---|---|---|
| 治る | なおる | To heal, to recover, to get better | Intransitive — the illness/person recovers naturally |
| 治療する | ちりょうする | To treat, to give medical treatment | Transitive — a doctor/person actively treats |
治る (なおる) — To Heal, To Get Better
治る is an intransitive verb (自動詞) — it describes healing or recovery that happens by itself, without specifying who does it. The illness goes away; the body heals.
- 風邪が治る — the cold heals/goes away
- 怪我が治る — the injury heals
- 病気が治った — the illness was cured (it got better)


薬を飲んだら風邪が治った。
After taking medicine, my cold got better.
| Japanese | English |
|---|---|
| 傷はもう治りましたか? | Has the wound healed yet? |
| その病気は治るのに時間がかかる。 | It takes time for that illness to heal. |
| 完全に治るまで安静にしてください。 | Please rest until you have fully recovered. |
治療する (ちりょうする) — To Treat Medically
治療する is a transitive action — someone (typically a medical professional) actively treats or applies therapy to an illness or injury. The focus is on the treatment process itself.
- 医者が患者を治療する — the doctor treats the patient
- 病院で治療を受ける — to receive treatment at a hospital
- がんを治療する — to treat cancer


Notice: 治療する can be ongoing even without a cure. A doctor can 治療する a chronic condition that may never 治る. 治る implies a successful outcome; 治療する only describes the act of treating.
| Japanese | English |
|---|---|
| この病院では最新の方法で治療しています。 | This hospital uses the latest methods to treat patients. |
| 歯医者で虫歯を治療してもらった。 | I had my cavity treated at the dentist. |
| 治療には数ヶ月かかる。 | Treatment will take several months. |
Key Difference: Intransitive vs. Transitive
| 治る (naoru) | 治療する (chiryou suru) | |
|---|---|---|
| Type | Intransitive (自動詞) | Transitive action (他動詞的) |
| Subject | The illness / the patient | The doctor or medical action |
| Focus | Recovery — the result | Treatment — the process |
| Implies cure? | Yes — the body healed | No — just the act of treating |
| Example | 病気が治った | 病気を治療した |
Quick Quiz
Choose 治る or 治療する:
- 病院でケガを___してもらった。(I had my injury ___ at the hospital.) → 治療して
- 薬を飲んで、ようやく風邪が___。(After taking medicine, my cold finally ___.) → 治った
- この病気は現在___中だ。(This disease is currently being ___.) → 治療
- 完全に___まで学校を休む。(I'll take time off school until I fully ___.) → 治る
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