thorn in the flesh

A constant or persistent cause of annoyance, frustration, or trouble. My little brother is such a thorn in the flesh—he always wants to do stuff with me, especially when I'm trying to hang out with my friends.

Common Names:

Name	Pronounced	Usage
Katinka	kah-TING-kah (German)	German, Dutch
Justinian	-	History
Uthyr	-	Welsh Mythology, Arthurian Romance
Jelka	-	Slovene, Croatian, Serbian
ŽArko	-	Serbian, Croatian
Vartan	-	Armenian