病気なので

because (someone) is sick

→ 病気
phrase Rare #30,527
because (someone) is sick 病気なので gives a reason or explanation and is followed by the result or action caused by being sick. なので is a polite-sounding explanatory form commonly used in both speech and writing.
JA: 病気なので、今日は早く寝ます。
EN: Because I'm sick, I'll go to bed early today.

母が病気なので私はその会合に出席できなかったのです

I couldn't attend the meeting because my mother was ill.

病気なのでご一緒できません

I'm sick, so I can't join you.

彼は病気なので顔色が悪い

He looks pale because he’s sick.

今日は病気なので会社を休みたいです

I'm sick today, so I'd like to take the day off work.

ジョーンズ先生が病気なので今日はブラウン先生が彼の代わりに教えます

Since Mr. Jones is sick, Mr. Brown will teach in his place today.

彼は病気なのでそのように扱うべきである

He is ill, so he should be treated accordingly.