Messing with their head - Idioms by The Free Dictionary
mess with (one's) head (redirected from messing with their head)
mess with (one's) head
To cause someone to feel confused, exasperated, frustrated, or anxious. All the rules and regulations with this business are really starting to mess with my head. I don't know why you have to mess with his head like that. If you don't want to be in a relationship with him, just say so!
mess with someone's head cause someone to feel frustrated, anxious, or upset. US informal
References in periodicals archive
BINGE-DRINKING teenagers could be messing with their heads
for good, scientists warned yesterday.
He's not done anything spectacular yet,but his very presence is messing with their heads