This child is suffering inner emotional turmoil and does not know how to deal with it in a healthy manner .
Oz if this is your child ,or one you have any contact with i suggest addressing the issue immediately . No ignoring the issue IT IS REAL, and not going away . A school counselor could be the first step in the right direction . Take the initiative if you are in a position of influence .
This Mom is afraid to face the problem ,that is just not a good excuse when you are a parent .