気になる

phrase

(idiomatic) to cause concern, to be worrisome, to be on one's mind / to be interested, to be curious

彼の健康状態が気になる。

I'm concerned about his health condition.

意味（1）

(idiomatic) to cause concern, to be worrisome, to be on one's mind

その頭痛(ずつう)が気(き)になる。

Sono zutsū ga ki ni naru.That headache is bothering me.

意味（2）

to be interested, to be curious