Anger

Anger is an emotional state that may range from minor irritation to intense rage. The physical effects of anger include increased heart rate, blood pressure, and levels of adrenaline and noradrenaline.[1] Some view anger as part of the fight or flight brain response to the perceived threat of pain.[2] Anger becomes the predominant feeling behaviorally, cognitively and physiologically when a person makes the conscious choice to take action to immediately stop the threatening behavior of another outside force.[3]


http://en.wikipedia.org/wiki/Anger