Anger is a natural emotion. A normal emotion. It can come as a normal reaction to frustration, criticism or a threatening situation and gives feelings of displeasure, dislike or irritation. You can also get angry as a delayed response to feelings of grief, sadness, loneliness or after having a fright.
But when it gets out of control and turns to rage,
a destructive form, it causes problems.
Personal relationships start to suffer. Work suffers, perhaps from the loss of a promotion or a reduction in earnings. But you also experience physical health changes with increased heart rate, increased blood pressure and increased adrenaline levels. In the long term, these also have a destructive impact on your health.