As human beings, our primary aim is to survive as individuals and as a race. We all have a biological mechanism to keep us safe, known as the fight or flight response.
It works brilliantly at keeping us physically safe in physical situations, such as in a fire or a car accident. We will quickly remove ourselves from the situation. We flee from it so that we don't face any further harm. However, many of the threats faced today are psychological. They can be the potential of not getting food at the shop this week or being made redundant from our work or fearing for the health of ourselves or others. These psychological threats can be more long term and cause more chronic stress.