が原因で

because of

→ が
phrase Uncommon #14,865
because of Follows a noun to identify it as the cause of something, often an undesirable result.
JA: 大雨が原因で、電車が遅れました。
EN: Because of the heavy rain, the train was delayed.

昨日、日本では地震が原因で多くの建物が倒壊しました。

Yesterday, many buildings collapsed in Japan due to an earthquake.

彼の場合何が原因で?

In his case, what caused it?

— ア・フュー・グッドメン (1992)

彼は昨夜の寒さが原因で死亡した。

He died from the cold last night.

彼は過労が原因で病気になった。

He became ill from overwork.

トムは学校でのいじめが原因で自殺した。

Tom committed suicide because of bullying at school.

私は騒音が原因で眠れない。

I can't sleep because of the noise.

乱暴が原因で?

Because of the violence?

— ダイ・ハード (1988)