Sometimes we experience a fight, or anger with someone, the emotion often passes. We calm down and get over it and, as we do, the physical symptom of arousal disappears as well. But sometimes we can experience emotional arousal which does not go away.
Being anxious about whether there will be enough money to pay the bills, for instance, is a continuous worry, not a passing thing. This means that it is constantly producing physiological arousal which does not go away.


