The system majorly involved in stress is our hormonal system, a delicately balanced instrument of numerous, interacting bits of biochemistry.
During a stressful moment our endocrine system secretes certain substances like adrenaline and cortisol and our pituitary and hypothalamus glands activate.
This automatic response developed in our ancient ancestors as a way to protect them from predators and other threats.
Faced with danger, the body kicks into gear, flooding the body with hormones that elevate the heart rate, increase blood pressure, boost energy and prepare us to deal with the problem.
So stress is positive, protecting us from dangers.
But in modern life something change…
These days, you're not likely to face the threat of being eaten. But you probably do confront multiple challenges every day, such as meeting deadlines, paying bills and juggling childcare that make your body react the same way.
In modern life the body overreact to stressors that are not life-threatening. In other words our body's natural alarm system (the “fight or flight” response) may be stuck in the on position. And that can have serious consequences for our health.
It is not exclusively connected to difficulties and unpleasant events. It is our body’s reaction to changes in our environment and psyches.