Understanding Stress 
Internally Generated Stress
Survival Stress
Where you are in a physically or emotionally threatening situation your body adapts to help it react more effectively to meet the threat. This is controlled mainly by release of adrenaline.Adrenaline causes a number of changes that help you to survive. The main ones are:
- it mobilises sugars: this gives your body access to more strength, energy and stamina. This helps you to fight harder or run faster.
- it reduces the blood supply to your skin and short-term inessential organs. This minimises bleeding if you are hurt, and ensures that energy is not wasted on processes that are not immediately useful.
- you may experience nausea or diarrhoea: this eliminates excess weight that might otherwise slow you down.
You may have experienced these changes as 'fear'. However where speed and physical strength are important this adrenaline stress will be helpful and beneficial - fear can help you to survive or perform better.
Where calm thought or precise motor skills are important, it is best to control and, ideally, eliminate these adrenaline responses.
In as much as these adrenaline changes shut down the function of organs that are essential in all but the short term, prolonged exposure to adrenaline can cause ill-health.
