I sometimes have a hard time distinguishing between tics and stims. difficult child 3 has a weird noise he makes, like a quiet growl, which I don't think he is even aware of. It is more frequent when he's anxious, also when he's concentrating.
He's had odd facial movements too, like a nose twitch or similar. He also picks at his skin, although I think that is Obsessive Compulsive Disorder (OCD).
With difficult child 3, it's down to his autism.
Marg
