痛いの

hurt(s)

→ 痛い
phrase Common #5,418
hurt(s) At the end of a sentence, の adds an explanatory or questioning tone. Whether it is a statement or a question depends on context and intonation.
JA: 足が痛いの。
EN: My foot hurts.

どこか痛いの?

Does anything hurt?

でもすごく痛いの

But it hurts a lot.

— When Marnie Was There (2014)

背中が痛いのです。

My back hurts.

やーしょーおなかが痛いの?

Hey, Sho, does your stomach hurt?

— 映画 聲の形 (2016)

痛いの

It hurts.

— 万引き家族 (2018)

お腹痛いの?

Does your stomach hurt?

どこ痛いのん?

Where does it hurt?

— 火垂るの墓 (1988)

ひどく痛いの?

Does it hurt badly?

なんで汗が目に入ると痛いの?

Why does it hurt when sweat gets in your eyes?

手が痛いの

My hand hurts.

— TAXi (1998)

「手が痛いの?」「少し痛い」

“Does your hand hurt?” “A little.”

どこが痛いの?

Where does it hurt?

トムはどこか痛いの?

Does Tom have pain anywhere?

頭でも痛いの?

Does your head hurt or something?

— 魔女の宅急便 (1989)

お腹が痛いの。

My stomach hurts.

えっと「またおなか痛いの?」

Um, "Does your stomach hurt again?"

— 映画 聲の形 (2016)

痛いの?

Does it hurt?

— ジョジョ・ラビット (2019)