Hej Stig.

I expect this is a child. Check out his mentals, find out how angry he is about anything (parent(s), siblings, school, life changes etc.) even if it may be suppressed. Ask him without parents present and ask parents without him being present. Observe the general dynamics between him and parents when both are present.

Think about constitutional prescribing, as well as remedies like Anacardium, Hyoscyamus, Lycopodium etc.

What sort of symptoms? Jerking, gestures w. hands, making faces, verbal abuse, stuttering etc.

Lycka till!