A nger can run the spectrum from mild irritation to rage, and rage is a form of temporary insanity. None of us can think or act effectively if we are angry.
Anger is a perfectly normal human emotion.
It is an adaptive survival response to threats and danger that helps us defend ourselves. It becomes a problem when it becomes inappropriate, prolonged, excessive, or out of control. Prehistoric man needed to develop a storm of anger to fight fiercely with a cave bear or saber-tooth tiger. His blood pressure went up, blood was diverted to his muscles, blood clotted easier. He or she may stay mad at a boss, spouse, or even a frustrating situation for days, even weeks.