It is unhealthy to keep difficult feelings emotions like anger, guilt, fear, contained. People need to feel able to express themselves honestly, openly and freely but people dont always feel able to do that, can feel restricted, trapped, prevented from doing so or in conflict with self, which can lead to stress and illness. Anger is seen as wrong, bad so people try to avoid acting out anger or they keep things to themselves instead which isnt good. Behind anger is hurt and fear. Anger is usually a response to something we feel is wrong, unfair, threatening us.. Ive heard a lot that depression is anger turned inwards.