頭痛の種

source of headaches

→ 頭痛
phrase Rare #37,522
source of headaches An idiom for a person or problem that causes worry, trouble, or annoyance; literally, “a seed of headaches.”
JA: この仕事は私にとって頭痛の種だ。
EN: This job is a source of headaches for me.

これが頭痛の種なのよ

This is such a headache.

君はいつも頭痛の種

You're always a pain in the neck.

早くしてくれ毎日頭痛の種なんだろ

Hurry up. Every day is a headache, isn't it?

— ブレット・トレイン (2022)