頭痛の種

a source of trouble

→ 頭痛
phrase Rare #40,258
a source of trouble Literally “the seed of a headache”; used for a persistent worry or troublesome person or thing.
JA: この仕事が最近の頭痛の種です。
EN: This job has been a source of trouble lately.

早くしてくれ毎日が頭痛の種なんだろ?

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

— ブレット・トレイン (2022)

君はいつも頭痛の種だ。

You're always a pain in the neck.

これが頭痛の種なのよ。

This is such a headache.