病気なの

are you sick?

→ 病気
phrase Uncommon #12,604
are you sick? The subject is often omitted and understood from context. The final の adds an explanatory or questioning tone.
JA: どうして休んだの?病気なの?
EN: Why were you absent? Are you sick?

うちの猫、病気なの。

My cat is sick.

病気なの

Are you sick?

— REC / レック (2007)

トムはまだ病気なの?

Is Tom still sick?

森に入ったのは兎を狩るためで娘たちのために病気なのです

I went into the forest to hunt rabbits because my daughters are sick.

— パンズ・ラビリンス (2006)

お母さんが病気なの

My mother is sick.

— パンズ・ラビリンス (2006)

病気なの?

Are you sick?

— TITANE/チタン (2021)

トムは病気なの?

Is Tom sick?