The times I get most angry is when upon closer inspection I have run into a person that triggers old feelings. Perhaps they remind me of someone of the past or their behavior does. Once I deal with the old issue it seems I can then deal effectively with the present one. Often once I have done the inner work the present problem is a non-issue.
This is a biggie for me. Sometimes I get triggered and I really don't know why. More often than not, it's old stuff...not the situation at hand.
I have a pretty bad temper. It flares up quickly. But it also fades quickly. I don't hold grudges too often and sometimes I forget even why I was mad. But I'm working on how quickly it flares. It's taken me 32 years to figure that out. I won't get better overnight. I find I like myself a lot more when I'm happy.