Psychological stress is, quite simply, a defensive reaction. When we feel defensive our brain automatically tells our body to produce adrenaline to give us extra energy and physical strength to fight or flee. This is called the fight or flight or freeze stress reaction and this defense reaction was researched by neuroscientist Walter Cannon in the 1960’s.
Every time we feel defensive in any way our body produces the automatic fight flight freeze stress reaction. What can make us defensive? The answer is, just about anything under the sun, as this is a very personal thing. You may say that when our coping skills don’t match up to the demands of our environment we will probably feel threatened or stressed.