My Son Has Been Stretching His Neck For The Past

my son has been stretching his neck for the past 3 weeks now at first i thought that it was just a habit but it is getting worse to the point he cant control it for the past week i have noticed that he is starting to stretch his arm and bend his fingers i ask him why is he doing that and he says that he feels like he has something in his throat what should i do should u schedule him to see our family doctor i am concerned that there can be something bad going on?