My 6 year-old DD, who is otherwise healthy and (as far as I can tell) happy, has in the past week developed this compulsive tic which consists of almost constant noises with her mouth which I can only really describe as like beat-boxing sounds.
It's literally almost non-stop. I'm a) worried that it could be some sort of compulsive behaviour and b) incredibly irritated by it although I'm trying not to show it. I've asked her about it in a non-judgemental way, i.e. is she doing it at school all the time (she says no).
Should I be worried? Could it be a sign of anxiety? Or a neurological thing? Or is it a phase? She doesn't seem to be psychologically disturbed in any way and seems happy -- her dad and I are separated and getting divorced and that has its stresses but this happened over two years ago and its not a source of acute stress to her as far as I'm aware... dad and I are on cordial terms, at least as far as she is concerned, and they have a good relationship.
She went through a phase of doing something similar about two years ago and this passed after about a month. It may be nothing, but I'm struggling not to show how annoying I find it. Any ideas?