Different types of Anger

A friend asked me at what point is anger born / what triggers anger. I penned a reply which I am reproducing here.

Anger is not born.

Either 

1. person is an angry person - Reflects person's general disposition.

or 

2. person becomes angry 

- this is expression of desperation or method of protest or person is programmed to use this method to resolve situation or problem

Or

3. person gets angry - this is the person's natural switch to tackle difficult situations or silence another 

or 

4. person remains angry - person holds on to the anger to continue in bad state

or 

5. person expresses anger - to end situation or solve problem. This is rare. Because person immediately returns to normal state on expressing it. The person uses a component of personality to do this.