Every anger reaction takes place in five stages. As with stress some of these stages occur in a fraction of a second and unless we purposefully pay attention we normally will not be aware of them.
Everything from frustration, bother, and irritation to full on rage are simply different degrees of anger. They are all the same emotion. The only difference is the strength of the feeling. On a scale of one to ten bother and irritation rate as one while full rage rates a ten. When the feeling is in the middle between 4 and 6 we normally call it anger.
But these are all just different degrees of one emotion: anger.
The 5 Stages of Anger
Note that when we believe we cannot win our anger is converted to resentment which is simply how we store anger. That saved anger returns when we believe can win revenge with some form of sabotage or so called "passive-aggressive" behavior.
The key to getting rid of unwanted anger is to eliminate the beliefs about what hurts us. Usually these beliefs take the form of expectations. Expectations are simply beliefs about how things should be to keep us safe.
Thus, the more expectations we have the angrier we become.