Everyday life proceeds along no matter how terrible circumstances become. But when traumatic events occur, everyday life doesn't solve them. Time alone cannot heal deep wounds. One after-effect of having something bad happen, whether it is the loss of a loved one, a bitter divorce, the outbreak of war, or being the victim of a crime, is anxiety. Millions of people suffer from anxiety and seek help from the billion-dollar market for tranquilizers or, less legitimately, opioids.
Anxiety often feels mysterious to those who suffer from it. Instead of being linked to a cause, such as being anxious to get to work on time when your car dies in traffic, modern anxiety is often free-floating. It's like a chronic condition that needs no immediate cause or is triggered by tiny causes that normally don't justify a feeling of anxiety.
To get at anxiety, there has to be an understanding of fear, because anxiety is residual fear. Despite the seemingly normal, untroubled activities of everyday life, something deeper down is generating the response of fear. So what is the role of fear as a human emotion? There is more than one function that fear plays, as follows: