what lies beneath anger?

Last night I did a little mini training in Julia Hankins Well-Being at Home Group all about anger. It is so important that we remember that anger is usually a warning that there is something going on that is much deeper. Anger can be the first thing you see (and react to) but what is lying beneath?
Some other emotions often masked by anger are: disappointment, embarrassment, guilt, shame, rejection, nervous, worried, hurt, insecure.
If you are seeing anger show up- either for yourself or for someone else, look a little deeper. What is really going on?