Anger is best viewed as a tool that helps us read and respond to upsetting social situations. Feeling angry increases optimism, creativity, [and] effective performance. Research suggests that expressing anger can lead to more successful negotiations, in life or on the job. In fact, repressing anger can actually hurt you. Dr. Ernest Harburg and his team at the University of Michigan School of Public Health spent several decades tracking the same adults in a longitudinal study of anger. They found that men and women who hid the anger they felt in response to an unjust attack subsequently found themselves more likely to get bronchitis and heart attacks, and were more likely to die earlier than peers who let their anger be known when other people were annoying. When anger arises, we feel called upon to prevent or terminate immediate threats to our welfare, or to the well-being of those we care about. Altruism is often born from anger; when it comes to mobilizing other people and creating support for a cause, no emotion is stronger. It's a mistake to presume that kindness, compassion, love, and fairness line up on one side of a continuum, and anger, rage, and dislike, on another side. Positivity alone is insufficient to the task of helping us navigate social interactions and relationships. A healthy society is not an anger-free society. The expression of authentic anger can be entirely appropriate with certain people in certain situations. The question is how you do that without letting it go too far.