How to tell them apart
つつ describes an ongoing process or two concurrent actions in formal writing, as in 検討しつつある, whereas ながら（も） expresses concession, acknowledging a contrast within a single noun or action, as in 若いながら（も）. Swapping them is unnatural: つつ cannot carry the although sense of ながら（も）, and ながら（も） does not express an action in progress like つつある.
- つつ Use つつ for an ongoing formal action or two simultaneous actions, often with ある.
- ながら（も） Use ながら（も） to express although or even though within one noun or action.
| Grammar point | Meaning | JLPT level |
|---|---|---|
| つつ tsutsu | in the midst of change; while; even though (formal) | N2 |
| ながら（も） nagara mo | during the time something happens; even so, in spite of that | N3 |
つつ tsutsu
in the midst of change; while; even though (formal)
つつある attaches to the masu-stem of a verb and expresses that something is gradually in the process of changing or happening. It has a formal, written feel, so it appears in news reports, surveys and speeches rather than casual talk.
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最近のある調査によると喫煙者の数は減少しつつある。
A recent survey shows that the number of smokers is decreasing.
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私の話を要約すると、社会は良くなりつつあるということだ。
To summarize, I'm saying that society is becoming better.
ながら（も） nagara mo
during the time something happens; even so, in spite of that
ながら links two simultaneous actions, attaching to a verb masu-stem (料理し, 読み, ふけり). Adding も, as in ながらも, adds a contrastive nuance of doing the second action despite the first (puffing and panting, yet still running).
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母は台所でせっせと料理しながら歌を口ずさんでいた。
Mother hummed to herself as she went about her cooking in the kitchen.
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ぜいぜい言いながらも、気合をいれて走り続ける。
Puffing and panting we continued to run with renewed vigor.
つつ and ながら（も） are JLPT N3–N2 grammar points that Japanese learners often mix up. This page compares them side by side on meanings, usage and example sentences, so you can tell them apart.