Everyone has likely felt anger at one time or another. While particular persons get mad more often than others and have regular, intense blowups, others tend to bottle their feelings and then blow up or flare up without warning.
Anger is a basic human emotion and a natural reaction to situations beyond our control. There are a lot of things that might set off or contribute to anger, like the actions of another person, an event, stress, expectations not being met, feeling hurt, contempt, humiliation, embarrassment, jealousy and grief.