ser una espina que Alguien tiene clavada

= be a thorn in + Posesivo + side

Ex. 'It's finally come to a showdown with Stuart Wronski. I guess you know he's been a thorn in my side for a long time. But he's finally gone too far, and I've got to do something about it.' He bit his lip, and looked at the floor.

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= be a thorn in + Posesivo + side

Ex: 'It's finally come to a showdown with Stuart Wronski. I guess you know he's been a thorn in my side for a long time. But he's finally gone too far, and I've got to do something about it.' He bit his lip, and looked at the floor.