Be assertive, not aggressive. one good way to keep your temper in check is to not get angry in the first place. if you feel angry over a disagreement with someone, the best way to express it is by sharing your feelings in a respectful way. Expressing anger in this way can be healthier than holding it in. those who hold back their feelings are more likely to develop passive-aggressive behavior and depression, as well as physical ailments like high blood pressure. When you assert your feelings, however, stay calm and refrain from behaviors such as yelling. it may feel good to "let it rip". But this behavior has been shown to increase anger, not relieve it. in short, don't be afraid to speak up, but be courteous at the same time.