The anger hasn't left. It's waiting to be processed.

Anger has a normal physiological cycle: the adrenaline and cortisol spike of the initial reaction clear within 20 to 60 minutes if you do not actively rehearse the trigger. When anger persists for days, it is almost always because the mental rehearsal is keeping the physiological arousal elevated. Every time you replay the incident, imagine the conversation you want to have, or imagine what you should have said, the stress response re-activates. The anger is sustained by the thoughts about the anger, not by the original trigger.

Anger is acute — a response to a perceived wrong, intended to signal the violation and motivate correction. It is time-limited and directed at a specific event. Resentment is chronic anger that has been rehearsed until it becomes a stable attitude toward a person or situation. The distinction matters because they respond to different interventions. Fresh anger often responds to direct communication or time. Resentment has usually calcified around a narrative ("this person always does this," "I am always treated this way") that needs the narrative examined, not the original event.

The evidence on anger expression is more nuanced than "expressing it is healthy." Venting anger — retelling the story in an aroused, blaming way — often increases rather than decreases anger. What helps is writing with the specific intent to understand the anger rather than to express it: what did I want that I didn't get, what rule or value do I feel was violated, was that violation intentional, what is within my control about the situation now? This kind of processing moves the thinking forward and reduces rumination; retelling the story does not.

Rumination is sustained by idle time with unstructured attention — lying awake, sitting in traffic, doing automatic tasks. The most effective interruption is not suppression (trying not to think about it) but redirection: a task requiring genuine cognitive engagement (a complex problem, a demanding physical activity, a conversation about something else entirely). Meditation paradoxically can worsen rumination for people who are already in a high-arousal angry state, since sustained attention to internal states feeds the loop. Physical exercise that is vigorous enough to require full attention is one of the most reliable pattern-interrupters for anger rumination.