Anger is an affective state in which the person concerned is unhappy in response to a situation in which they feel they have been treated unfairly and in which they strongly desire to change the situation. People usually become angry when they cannot fulfil some basic need or desire that is important to them. When anger itself is frustrated, the individual often develops feelings of hostility and hatred toward other persons. Anger is a very basic human emotion that plays an important role in the way we communicate with others. Healthy anger is the legitimate response to injustice, abuse, and loss.
Destructive anger is driven by feelings of inadequacy, and frustration.
Like all natural responses, anger serves a useful purpose, but to do so it must be carefully controlled.