While rehab will not treat your anger directly, it will provide a safe and supportive environment to help you understand and manage the triggers which exacerbate both your addiction and your anger. Your addiction treatment programme will include individual counselling, group therapy and other types of therapy to help you learn healthy ways to cope with difficult emotions. Substance abuse is a major cause of irrational anger so when you are no longer dependent on substances, you should find that you are more in control of your anger and are able to react to situations in a more rational, controlled way.