What is it?
A stressful situation - whether this be something environmental stress such as a traffic jam or psychological stress such as chronic worry around money - can trigger a cascade of stress hormones that produce a well orchestrated amount of physiological change in our bodies.
This is know as your “fight or flight” response and it’s evolved as a survival mechanism to react to a life threatening situations and is designed to keep you alive.
So how does it all work?
A stressful event causes the emotional processing part of the brain (amygdala) to send a distress signal to the command centre (hypothalamus).
The command centre (hypothalamus) is the area of the brain that communicates with the rest of the body throughout the autonomic nervous system.
This controls such involuntary processes such as: breathing, blood pressure, heart rate and airways.
The autonomic nervous system is like a car with two pedals - a gas pedal (sympathetic nervous system) and a brake (parasympathetic nervous system).
When the gas pedal is pressed we have a whole host of chemicals and processes that happen automatically - adrenaline, corticotropin-releasing hormone (CRH), adrenocorticoteopic hormone (ACTH) and cortisol all join in on the action with one goal - more gas!
This whole system then stays revved up until the perceived threat passes and we apply the “brake” (parasympathetic nervous system) to dampen the stress response.
This process happens so quickly that we aren’t even aware they are happening, in fact the amygdala and hypothalamus are so efficient at processing they start this process even before our brains visual centres have had chance to fully process what is happening in the situation.